//Checking du navigateur

var uAgent=navigator.userAgent;

var ns4 = (document.layers)? true:false;   //NS 4 

var ie4 = (document.all)? true:false;   //IE 4 

var dom = (document.getElementById)? true:false;   //DOM 

var ope = uAgent.indexOf("Opera")>-1 && dom? true:false; // + OP5

var ie5 = (dom && ie4 && !ope)?true:false; // IE5

var ns6 = (dom && uAgent.indexOf("Netscape")>-1)? true:false; // + NS 6

var khtml = uAgent.indexOf("khtml")>-1? true:false; // + Konqueror

//alert("UserAgent: "+uAgent+"\nns4 :"+ns4+"\nie4 :"+ie4+"\ndom :"+dom+"\nie5 :"+ie5+"\nns6 :"+ns6+"\nope :"+ope+"\nkhtml :"+khtml);



//gestion des objets selon les navigateurs

function ob(id) {

if (dom) obj = document.getElementById(id);

else if (ie4) obj = document.all[id];

else if (ns4) obj = document.anchors[id];

else obj=false;

return obj;

}



// Fade

Array.prototype.inArray=function(str){//on modifie l'objet Array

for(i=0; i< this.length; i++)if(this[i].toString()==str)return i;

return -1;

}

//On modifie l'objet String

String.prototype.exist=function(){return (this=="undefined"?false:true);};

//Opacité

function setOpacity(id,alpha,isObj) {

	if(!dom)return;

	var object = isObj?id:ob(id); 

	if(String(typeof object.filters).exist())object.filters.alpha.opacity = alpha;

	else if(String(typeof object.style.opacity).exist()) object.style.opacity = (alpha/100);

	else if(String(typeof object.style.KhtmlOpacity).exist()) object.style.KhtmlOpacity = (alpha/100);

	else if(String(typeof object.style.MozOpacity).exist()) object.style.MozOpacity = (alpha/100);

}

function getOpacity(id,isObj){

	if(!dom)return;

	var object = isObj?id:ob(id), alpha=null; 

	if(String(typeof object.filters).exist()) alpha = object.filters.alpha.opacity;

	else if(String(typeof object.style.opacity).exist()) alpha = object.style.opacity*100;//css3 propertie

	else if(String(typeof object.style.KhtmlOpacity).exist()) alpha = object.style.KhtmlOpacity*100;

	else if(String(typeof object.style.MozOpacity).exist()) alpha = object.style.MozOpacity*100;

	return alpha;

}

// Fading

vit=5; //temps entre chaque addition d'opacité(+ petit -> + de qualité -> + dur pour le navigateur) 

add=4; //valeur à additionner (idem)

nObj=0;



fadeObjects=new Object();

fadeTimers=new Object();

fadeIds=new Array();

function fade2(object, destOp){

if (!dom) return;

if (object.toString().indexOf("[object")==-1){setTimeout("fade2("+object+","+destOp+")",0); return;}

alpha=getOpacity(object,true);

index=fadeIds.inArray(object.id);

if(index>-1)clearTimeout(fadeTimers[index]);

else {

index=nObj++;

fadeIds[index]=object.id;

}

diff = destOp-alpha;

direction=1;

if (alpha > destOp)direction=-1;//de - en - opaque

alpha+=direction * Math.min(direction*diff,add);//ajoute le + petit entre la diférence et add 

setOpacity(object,alpha,true);

alpha=getOpacity(object,true);

object.offsetLeft;

if (Math.round(alpha) != destOp){

fadeObjects[index]=object;

fadeTimers[index]=setTimeout("fade2(fadeObjects["+index+"],"+destOp+")",vit);

}

return;

}