// JavaScript Document
// Dynamic Text Fader (2.20)
// (Updated on 20/12/2000)
// Script created by Nicholas Poh Tze Siang aka Programatix
// Copyright (c) 2000
// (hwinmain@yahoo.com)
var strFaderName = 'Dynamic Text Fader 2.20';
var strCopyright = 'Copyright (c) Nicholas Poh 2000';

// Check for browser and version
var g_fBrowser = 0;
var navName = navigator.appName;
var navVer  = parseFloat(navigator.appVersion);

if (document.all) {
	// Microsoft Internet Explorer 5 or compatible
	g_fBrowser = 2;
} else if (document.getElementById) {
	// Netscape 6 or DOM compatible browser
	g_fBrowser = 3;
} else if (document.layers) {
	// Netscape 4 or compatible
	g_fBrowser = 1;
} else {
	// Sometimes Netscape 4 reaches here. So, make sure it still works.
	if (navName == "Netscape" && navVer >= 4) {
		g_fBrowser = 1;
	} else {
		// unknown and not supported
		g_fBrowser = 0;
	}
}
// End of check

// Global variables
var DynFaderList = new Array();		// List of Dynamic Faders
// End of Global variables

// Create a hex convertor array (Dex2Hex[])
var hexbase= new Array("0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F");
var value=0;
var Dec2Hex=new Array();
for (x=0; x<16; x++){
	for (y=0; y<16; y++){
		Dec2Hex[value]= hexbase[x] + hexbase[y];
		value++;
	}
}
// End of create a hex convertor array (Dex2Hex[])

// Combine RGB colour 
function RGB(r, g, b)
{
	return ((r&0xFF)<<16) + ((g&0xFF)<<8) + (b&0xFF);
}

// Convert RGB colour from string to numeric
function StrRGB2Num(color)
{
	var temp;
	temp = color;
	return Number('0x'+temp.substr(1,temp.length));
}

// Convert RGB colour to string base
function RGB2STR(rgbcolor)
{
	return Dec2Hex[rgbcolor>>16] + Dec2Hex[(rgbcolor>>8)&0xFF] + Dec2Hex[rgbcolor&0xFF];
}

// Find layer
function findLayer(name, doc)
{
	if (document.layers) {
		var i, layer;
	
		for (i = 0; i < doc.layers.length; i++) {
			layer = doc.layers[i];
			if (layer.name == name) return layer;
			if (layer.document.layers.length > 0) {
				layer = findLayer(name, layer.document);
				if (layer != null) return layer;
			}
		}
	}
	return null;
}

// Change the HTML text
function changeHTMLText(element, newText, object)
{
	if (document.all) {
		// Microsoft Internet Explorer 5 or compatible
		element.innerHTML = newText;
	} else if (document.getElementById) {
		// Netscape 6 or DOM compatible browser
		rng = document.createRange();
		rng.setStartBefore(element);
		htmlFrag = rng.createContextualFragment(newText);
		while (element.hasChildNodes()) element.removeChild(element.lastChild);
		element.appendChild(htmlFrag);
	} else if (document.layers) {
		// Netscape 4 or compatible
		strTemp = '<DIV CLASS="' + object.name + '">' + newText + '</DIV>';
		
		element.document.open();
		element.document.fgColor = object.curcolor & 0xFFFFFF;		
		element.document.writeln(strTemp);
		element.document.close();
	}
}

function insertPlaceHolder(strName, width, height, align, bgcolor, border, bordercolor)
{
	if (String(width)  =="undefined") var width   = "100%";
	if (String(height) =="undefined") var height  = 100;
	if (String(align)  =="undefined") var align   = "left";
	if (String(bgcolor)=="undefined") var bgcolor = "";
	if (String(border) =="undefined") var border  = 0;
	if (String(bordercolor)=="undefined") var bordercolor = "";
	
	if (g_fBrowser == 0) {
		document.writeln("Browser not supported");
		return;
	}

	switch(g_fBrowser) {
	case 1:
		document.writeln(
			'<TABLE ALIGN="' + align + '" CELLSPACING="0" CELLPADDING="0" BORDER="' + border + '" BORDERCOLOR="' + bordercolor + '">' +
			'<TR><TD>' +
			'<ILAYER NAME="' + strName + '" BGCOLOR="' + bgcolor + '" VISIBILITY="inherit">' +
			'<LAYER NAME="Content" WIDTH=' + width + ' HEIGHT=' + height + ' VISIBILITY="inherit">' +
			'</LAYER>' +
			'</ILAYER>' +
			'</TD></TR>' +
			'</TABLE>'
		);
		break;

	case 2:
	case 3:
		document.writeln(
			'<DIV ALIGN=' + align + '>' +
			'<DIV ID="'+strName+'" STYLE="width:' + width +'; height:' + height + '; overflow:hidden; background:'+bgcolor+'; border-style:outset; border-width:'+border+'; border-color:'+bordercolor+'">' +
			'<DIV ID="'+strName+'Content" STYLE="position:relative; width:100%;">' +
			'</DIV>' +
			'</DIV>' +
			'</DIV>'
		);
		break;
	}
}

function DynFader()
{
	this.name;
	this.width;
	this.height;
	this.contentHeight;
	this.offset  = 20;
	this.curXPos = 0;
	this.curYPos = -this.offset;
	this.curPos = 0;
	this.midYPos = 0;
	this.ydir = 1;
	this.xdir = 0;

	this.placeholder;
	this.content;
	this.text = new Array();
	this.curText = -1;
	
	this.loop = -1;
	this.paused = true;
	this.started = false;
	this.pauseInterval = 125;
	this.pauseTextInterval = 0;
	this.curpauseInterval = 0;
	this.fgcolor  = 0x000000;
	this.bgcolor  = 0xFFFFFF;
	this.dfcolor  = 0;
	this.curdfcolor  = 0;
	this.curcolor = 0;
	this.dfRed   = 0;
	this.dfGreen = 0;
	this.dfBlue  = 0;
	
	this.isFade = false;
	
	// Define methods
	this.addText = DynFaderAddText;
	this.attachPlaceHolder = DynFaderAttachPlaceHolder;
	this.setTextColor = DynFaderSetTextColor;
	this.start = DynFaderStart;
	this.stop = DynFaderStop;
	this.beginFade = DynFaderBeginFade;
	this.calcColorDif = DynFaderCalcColorDif;
	this.getColorDif = DynFaderGetColorDif;
	this.setFont = DynFaderSetFont;
	this.setFontSize = DynFaderSetFontSize;
	this.setBackground = DynFaderSetBackground;
	this.setDirection = DynFaderSetDirection;
	this.setSpeed = DynFaderSpeed;
	this.setPauseMidInterval = DynFaderSetPauseMidInterval;
	this.setPauseTextInterval = DynFaderSetPauseTextInterval;
	this.getContentHeight = DynFaderGetContentHeight;
	this.setLoop = DynFaderSetLoop;
	this.setGlow = DynFaderSetGlow;
	
	DynFaderList[DynFaderList.length] = this;
}

function DynFaderAddText(newText)
{
	this.text[this.text.length] = newText;
}

function DynFaderAttachPlaceHolder(strPlaceHolder)
{
	switch(g_fBrowser) {
	case 1:
		this.name = strPlaceHolder;
		this.placeholder = findLayer(strPlaceHolder, document);
		this.content = this.placeholder.document.Content;
		this.width   = this.placeholder.clip.width;
		this.height  = this.placeholder.clip.height;
		this.content.top = this.curYPos;
		break;
		
	case 2:
		this.placeholder = eval('document.all.' + strPlaceHolder);
		this.content = eval('document.all.' + strPlaceHolder+'Content');
		this.width   = this.placeholder.style.pixelWidth;
		this.height  = this.placeholder.style.pixelHeight;
		this.content.style.pixelTop = this.curYPos;
		break;
		
	case 3:
		this.placeholder = document.getElementById(strPlaceHolder);
		this.content = document.getElementById(strPlaceHolder+'Content');
		this.width   = parseInt(this.placeholder.style.width);
		this.height  = parseInt(this.placeholder.style.height);
		this.content.style.top = this.curYPos;

		break;
	}
}

function DynFaderSetTextColor(r, g, b)
{
	this.fgcolor = RGB(r, g, b);
	switch(g_fBrowser) {
	case 1:
		this.content.document.fgColor = this.fgcolor;
		break;
		
	case 2:
		this.content.style.color = this.fgcolor;
		break;

	case 3:
		this.content.style.color = "#" + RGB2STR(this.fgcolor);
		break;
	}
}

function DynFaderSetTextColor(strColor)
{
	if (isNaN(strColor)) this.fgcolor = StrRGB2Num(strColor);
	this.curcolor = this.fgcolor;
	switch(g_fBrowser) {
	case 1:
		this.content.document.fgColor = this.color;
		break;
		
	case 2:
		this.content.style.color = this.fgcolor;
		break;

	case 3:
		this.content.style.color = "#" + RGB2STR(this.fgcolor);
		break;
	}
}

function DynFaderStart()
{
	if (this.ydir > 0) {
		this.curYPos = this.height + 1;
	} else {
		this.curYPos = -this.getContentHeight() - 1;
	}
	this.started = true;
}

function DynFaderStop()
{
	this.started = false;
}

function DynFaderBeginFade()
{
	this.calcColorDif();
	this.isFade = true;
	this.start();
}

function DynFaderCalcColorDif()
{
	switch(g_fBrowser) {
	case 1:
		this.bgcolor = this.placeholder.bgColor;
		if (this.bgcolor == null) this.bgcolor = StrRGB2Num(document.bgColor);
		break;

	case 2:
	case 3:
		this.bgcolor = StrRGB2Num(this.placeholder.style.backgroundColor);
		if (isNaN(this.bgcolor)) this.bgcolor = StrRGB2Num(document.bgColor);
		break;
	}

	this.dfRed   = ((this.bgcolor>>16) - (this.fgcolor>>16));
	this.dfGreen = (((this.bgcolor>>8)&0xFF) - ((this.fgcolor>>8)&0xFF));
	this.dfBlue  = ((this.bgcolor&0xFF) - (this.fgcolor&0xFF));
	this.curcolor = this.bgcolor;
}

function DynFaderGetColorDif(steps)
{
	steps  += this.height;
	steps >>= 1;
	steps  /= Math.abs(this.ydir);
	this.curdfcolor = this.dfcolor = -(((this.dfRed/steps)<<16) + ((this.dfGreen/steps)<<8) + (this.dfBlue/steps));
}

function DynFaderSetFont(fontfamily, fontweight, textalign)
{
	switch(g_fBrowser) {
	case 1:
		if (fontfamily) document.classes[this.name].all.fontFamily = fontfamily;
		if (fontweight) document.classes[this.name].all.fontWeight = fontweight;
		if (textalign)  document.classes[this.name].all.textAlign = textalign;
		break;
		
	case 2:
	case 3:
		if (fontfamily) this.content.style.fontFamily = fontfamily;
		if (fontweight) this.content.style.fontWeight = fontweight;
		if (textalign)  this.content.style.textAlign  = textalign;
		break;
	}
}

function DynFaderSetFontSize(fontsize)
{
	// Unit is required for Netscape 6
	if (!isNaN(fontsize)) fontsize += 'pt';

	switch(g_fBrowser) {
	case 1:
		if (fontsize) document.classes[this.name].all.fontSize = fontsize;
		break;
		
	case 2:
		this.content.style.fontSize = fontsize;
		break;

	case 3:
		this.content.style.fontSize = fontsize;
		break;
	}
}

function DynFaderSetBackground(image)
{
	switch(g_fBrowser) {
	case 1:
		this.placeholder.background.src = image;
		break;
		
	case 2:
	case 3:
		this.placeholder.style.backgroundImage = 'url('+image+')';
		break;
	}
}

function DynFaderSetDirection(iDir)
{
	switch(iDir) {
	case 0:
		this.ydir = Math.abs(this.ydir);
		break;
		
	case 1:
		this.ydir = -Math.abs(this.ydir);
		break;
		
	default:
		this.ydir = Math.abs(this.ydir);
	}
}

function DynFaderSpeed(Speed)
{
	if (this.ydir > 0) {
		this.ydir = Math.abs(Speed);
	} else {
		this.ydir = -Math.abs(Speed);
	}
}

function DynFaderSetPauseMidInterval(time)
{
	this.pauseInterval = Math.abs(time);
}

function DynFaderSetPauseTextInterval(time)
{
	this.pauseTextInterval = Math.abs(time);
}

function DynFaderGetContentHeight()
{
	switch(g_fBrowser) {
	case 1:
		this.contentHeight = this.content.document.height;
		break;

	case 2:
		this.contentHeight = this.content.clientHeight;
		break;

	case 3:
		this.contentHeight = this.content.offsetHeight;
		break;
	}
	return this.contentHeight;
}

function DynFaderSetLoop(loops)
{
	this.loop = loops;
}

function DynFaderSetGlow(strength, glowColor, fgColor)
{
	switch(g_fBrowser) {
	case 1:
		break;
		
	case 2:
		if (String(fgColor) != "undefined") this.setTextColor(fgColor);
		this.content.style.filter = "glow(color="+glowColor+",strength="+strength+")";
		break;

	case 3:
		break;
	}
}

// Scrolling section
function ScrollFader()
{
	var fader;
	if (String(DynFaderList[0]) == "undefined") return;
	
	for (var i in DynFaderList) {
		fader = DynFaderList[i];
		if (fader.started == false) continue;
		if (fader.paused) {
			if (fader.curpauseInterval-- <= 0) {
				fader.paused = false;
			}
		} else {
			fader.curYPos += fader.ydir;
//			fader.curXPos += fader.xdir;
			
			if (fader.curYPos == fader.midYPos) {
				if (fader.pauseInterval) {
					fader.curpauseInterval = fader.pauseInterval;
					fader.paused = true;
				}
				fader.curYPos = (fader.height - fader.contentHeight) >> 1;
				if (fader.isFade) {
					fader.curdfcolor = -fader.dfcolor;
					fader.curcolor = fader.fgcolor;
				}
			} 

			if (fader.isFade) {
				// Change text colour
				switch(g_fBrowser) {
				case 1:
					if (fader.curText >= 0) {
						changeHTMLText(fader.content, fader.text[fader.curText], fader);
					}
					break;

				case 2:
					fader.content.style.color = fader.curcolor;
					break;
					
				case 3:
					fader.content.style.color = "#" + RGB2STR(fader.curcolor);
					break;
				}
				
				fader.curcolor+= fader.curdfcolor;
			}
			
			if (fader.curYPos > fader.height || fader.curYPos < -fader.contentHeight) {
				// Prepare for next text
				var ShowCopyright = false;
				if (++fader.curText > fader.text.length - 1) {
					// End of text array reached
					fader.curText = 0;
					if (this.loop == -1) {
						// infinite loop
						if (Math.round(Math.random()*20) == 7) {
							ShowCopyright = true;
							fader.curText = -1;
						}
					} else {
						if (--fader.loop == 0) {
							// Last loop reached
							fader.stop();
						}						
					}
				}

				// Rewrite the text
				switch(g_fBrowser) {
				case 1:
					fader.content.top = fader.height;
					break;
				
				case 2:
					fader.content.style.pixelTop = fader.height;
					
				case 3:
					fader.content.style.top = fader.height;
					break;
				}
				if (ShowCopyright) {
					changeHTMLText(fader.content, strFaderName + '<BR>' + strCopyright, fader);
				} else {
					changeHTMLText(fader.content, fader.text[fader.curText], fader);
				}

				
				// Reset values
				fader.getContentHeight();
				
				if (fader.isFade) {
					fader.getColorDif(fader.contentHeight);
					fader.curcolor = fader.bgcolor;
				}
				if (fader.ydir > 0) {
					fader.midYPos = ((fader.height - fader.contentHeight) >> 1) + fader.contentHeight;
					fader.midYPos = (Math.round(fader.midYPos / fader.ydir) * fader.ydir) - fader.contentHeight;
					fader.curYPos = -fader.contentHeight;
				} else {
					fader.midYPos = ((fader.height - fader.contentHeight) >> 1) + fader.height;
					fader.midYPos = (Math.round(fader.midYPos / fader.ydir) * fader.ydir) - fader.height;
					fader.curYPos = fader.height;
				}

				if (fader.pauseTextInterval) {
					fader.curpauseInterval = fader.pauseTextInterval;
					fader.paused = true;
				}
			}
		
			// Scroll text
			switch(g_fBrowser) {
			case 1:
				fader.content.top = fader.curYPos;
				break;
				
			case 2:
				fader.content.style.pixelTop = fader.curYPos;
				break;

			case 3:
				fader.content.style.top = fader.curYPos;
				break;
			}
		}
	}
}

// Start timer
var g_timerID;

if (g_fBrowser == 1) {
	var g_winWidth;
	var g_winHeight;

	g_winWidth  = window.innerWidth;
	g_winHeight = window.innerHeight;
	window.captureEvents(Event.RESIZE);
	window.onResize = FaderReload;
}

setTimeout('FaderStart()', 600);

function FaderStart()
{
	g_timerID = setInterval(ScrollFader, 20);
	window.onUnload = FaderUnload;
}

function FaderUnload(e)
{
	clearInterval(g_timerID);
	return window.routeEvent(e);
}

function FaderReload(e)
{
	if (g_winWidth == window.innerWidth && g_winHeight == window.innerHeight) return;
	this.location.href = this.location.href;
	this.focus();

	return window.routeEvent(e);;
}