Le petit script suivant vous permet d'obtenir un effet de fondu sur n'import quel objet html

/*****************************************\
||       Fade Script Version 4.0         ||
||   http://anarchos.xs.mw/fade.phtml    ||
||            (c) July 2001              ||
|| _____________________________________ ||
|| Created by:                           ||
|| Anarchos    > anarchos.xs.mw          ||
|| _____________________________________ ||
|| auto-startColor by Mike West          ||
|| mike@westman.org                      ||
|| _____________________________________ ||
|| uniqueID upgrade by DubMatrix         ||
|| http://www.princefari.com             ||
|| _____________________________________ ||
|| Color conversion from decimal to      ||
|| hex (dehexize function) by:           ||
|| Litejet > litejet@hotmail.com         ||
|| _____________________________________ ||
|| Fade, hex, setColor functions by:     ||
|| Dak Phoenix > phoenix-archetypes.com  ||
|| _____________________________________ ||
|| domouseover/out based on scripts by   ||
|| The Shadow  > www.icon.co.za/~andrewk ||
||                                       ||
|| _____________________________________ ||
|| Netscape v4+ support added by         ||
|| tk102 > zxcvbnm6012@yahoo.com         ||
|| Mar 24, 2004                          ||
|| _____________________________________ ||
|| BackColor support added         ||
|| iDo > http://www.woow-fr.com/wikistuce         ||
|| 15/09/05                          ||
\*****************************************/
 
// This part is configurable
//------------------------------------------------
BackColor=true; // Si true, change le fond, sinon, change la police
startColor = "#148AB0"; // MouseOut link color
endColor = "#FFF2CC"; // MouseOver link color
stepIn = 27; // delay when fading in
stepOut = 27; // delay when fading out
autoFade = true;
sloppyClass = true;
//------------------------------------------------
 
hexa = new makearray(16);
for(var i = 0; i < 10; i++)
hexa[i] = i;
hexa[10]="a"; hexa[11]="b"; hexa[12]="c";
hexa[13]="d"; hexa[14]="e"; hexa[15]="f";
 
var version = parseInt(navigator.appVersion)
var appName = navigator.appName
var ns4 = version>=4 && appName=="Netscape"
 
if (ns4) { //Netscape 4+
	document.onmouseover = doN4mouseover;
	document.onmouseout = doN4mouseout;
} else { //other
	document.onmouseover= domouseover;
	document.onmouseout= domouseout;
}
 
startColor = dehexize(startColor.toLowerCase());
endColor = dehexize(endColor.toLowerCase());
var fadeId = new Array();
 
function dehexize(Color){
	var colorArr = new makearray(3);
	for (i=1; i<7; i++){
		for (j=0; j<16; j++){
			if (Color.charAt(i) == hexa[j]){
				if (i%2 !=0)
					colorArr[Math.floor((i-1)/2)]=eval(j)*16;
				else
					colorArr[Math.floor((i-1)/2)]+=eval(j);
			}
		}
	}
	return colorArr;
}
 
function domouseover() {
	if(document.all){
		var srcElement = event.srcElement;
		if ((srcElement.tagName == "A" && autoFade) || srcElement.className == "fade" || (sloppyClass && srcElement.className.indexOf("fade") != -1))
			fade(startColor,endColor,srcElement.uniqueID,stepIn);
	}
}
 
function domouseout() {
	if (document.all){
		var srcElement = event.srcElement;
		if ((srcElement.tagName == "A" && autoFade) || srcElement.className == "fade" || (sloppyClass && srcElement.className.indexOf("fade") != -1))
			fade(endColor,startColor,srcElement.uniqueID,stepOut);
	}
}
function doN4mouseover(event) {
	var srcElement=event.target;
	if ((srcElement.tagName == "A" && autoFade) || srcElement.className == "fade" || (sloppyClass && srcElement.className.indexOf("fade") != -1))
		nfade(startColor,endColor,srcElement,stepIn);
}
 
function doN4mouseout(event) {
		var srcElement = event.target; 
		if ((srcElement.tagName == "A" && autoFade) || srcElement.className == "fade" || (sloppyClass && srcElement.className.indexOf("fade") != -1))
		 nfade(endColor,startColor,srcElement,stepOut);
}
 
function makearray(n) {
	this.length = n;
	for(var i = 1; i <= n; i++)
	this[i] = 0;
	return this;
}
 
function hex(i) {
	if (i < 0)
		return "00";
	else if (i > 255)
		return "ff";
	else
		return "" + hexa[Math.floor(i/16)] + hexa[i%16];
}
 
function setColor(r, g, b, element) {
	var hr = hex(r);
	var hg = hex(g);
	var hb = hex(b);
	if (BackColor==true) {
		element.style.background = "#"+hr+hg+hb;
	} else {
		element.style.color = "#"+hr+hg+hb;
	}
}
 
 
function fade(s,e, element,step){
	var sr = s[0];
	var sg = s[1];
	var sb = s[2];
 
	var er = e[0];
	var eg = e[1];
	var eb = e[2];
 
	if (fadeId[0] != null && fade[0] != element){  //check have we already faded this?
		setColor(sr,sg,sb,eval(fadeId[0]));   // no, set the first color
		var i = 1;
		while(i < fadeId.length){             //get ready to fade
			clearTimeout(fadeId[i]);
			i++;
		}
	}
        //MSIE must setup timeouts using strings        
	for(var i = 0; i <= step; i++) { //timeouts fall like dominos
		fadeId[i+1] = setTimeout("setColor(Math.floor(" +sr+ " *(( " +step+ " - " +i+ " )/ " +step+ " ) + " +er+ " * (" +i+ "/" +
		step+ ")),Math.floor(" +sg+ " * (( " +step+ " - " +i+ " )/ " +step+ " ) + " +eg+ " * (" +i+ "/" +step+
		")),Math.floor(" +sb+ " * ((" +step+ "-" +i+ ")/" +step+ ") + " +eb+ " * (" +i+ "/" +step+ ")),"+element+");",i*step);
	}
	fadeId[0] = element; // oneshot
}
function nfade(s,e, element,step){ 
	var sr = s[0];
	var sg = s[1];
	var sb = s[2];
 
	var er = e[0];
	var eg = e[1];
	var eb = e[2];
 
	if (fadeId[0] != null && fade[0] != element){  //check have we already faded this?
		setColor(sr,sg,sb,eval(fadeId[0]));   // no, set the first color
		var i = 1;
		while(i < fadeId.length){             //get ready to fade
			clearTimeout(fadeId[i]);
			i++;
		}
	}
        //Netscape can call SetTimeout using objects, making for more readable code
	for(var i = 0; i <= step; i++) { 
		fadeId[i+1] = setTimeout(
					setColor,
					i*step,
					Math.floor(sr*((step-i)/step) + er*(i/step)),
					Math.floor(sg*((step-i)/step) + eg*(i/step)),
					Math.floor(sb*((step-i)/step) + eb*(i/step)),
					element
					);
	}
	fadeId[0] = element; //oneshot
}

Il suffit d'inclure ce code dans une page html pour que toute les balises souhaité passe en fade.

Il y a certain option parametrable :

BackColor=true; // Si true, change le fond, sinon, change la couleur de police
startColor = "#148AB0"; // Couleur quand la souris ne survole plus
endColor = "#FFF2CC"; // Couleur quand la souris survole
stepIn = 27; // Durée du fade lors du survol
stepOut = 27; // Duré du fade lors de la sortie du survol
autoFade = true; //Si true, met un fade sur tout les lien, sinon, les liens reste "normaux"
sloppyClass = false; //Si true, met le fade sur tout les element qui on une classe !