function cherche_config(){

	// recherche de la config ecran...
	
	ecran=screen.width
	
	// recherche du navigateur...
	var NomNav = navigator.appName; //  nom du navigateur 
	var TypeNav=""
	if(NomNav.indexOf('Internet Explorer') != -1 ) {type_nav="ie"}
	else if (NomNav.indexOf('Netscape') != -1 ) {type_nav="N"}
	else(type_nav="inc")
	var VersNav = navigator.appVersion; //  version du navigateur 
	var NumVers = parseFloat(VersNav); // Transforme la chaîne
	origine=(ecran-758)/2
	document.getElementById("course").style.left=360+origine
	document.getElementById("programme").style.left=445+origine
	document.getElementById("inscription").style.left=557+origine
	document.getElementById("partenaire").style.left=600+origine
	
}
//Détection du navigateur
var ns4 	= document.layers;
var op5		= (navigator.userAgent.indexOf("Opera 5")!=-1) ||(navigator.userAgent.indexOf("Opera/5")!=-1);
var op6		= (navigator.userAgent.indexOf("Opera 6")!=-1) ||(navigator.userAgent.indexOf("Opera/6")!=-1);
var agt		= navigator.userAgent.toLowerCase();
var mac		= (agt.indexOf("mac")!=-1);
var ie		= (agt.indexOf("msie") != -1); 
var mac_ie	= mac && ie;

//Retourne un objet avec Netscape 4
function getObjNN4(obj,name){
	var x = obj.layers;
	var foundLayer;
	for (var i=0;i<x.length;i++){
		if(x[i].id == name)
			foundLayer = x[i];
		else if(x[i].layers.length)
			var tmp = getObjNN4(x[i],name);
		if(tmp)
			foundLayer = tmp;
	}
	return foundLayer;
}

//Retourne l'élément courant
function getElementById(id){
	if(document.getElementById && document.getElementById(id)){
		return document.getElementById(id);
    }else if(document.all && document.all(id)){
		return document.all(id);
    }else if(document.layers && document.layers[id]){
		return getObjNN4(document,id);
    }else{
		return false;
    } 
}

//Retourne le style de l'objet
function getStyleObject(objectId) {
	if(document.getElementById && document.getElementById(objectId)){
		return document.getElementById(objectId).style;
    }else if(document.all && document.all(objectId)){
		return document.all(objectId).style;
    }else if(document.layers && document.layers[objectId]){
		return getObjNN4(document,objectId);
    }else{
		return false;
	} 
}

//Retourne la position X de l'élément
function getElementLeft(Elem) {
	if (ns4) {
		var elem = getObjNN4(document, Elem);
		return elem.pageX;
	} else {
		var elem;
		if(document.getElementById) {
			var elem = document.getElementById(Elem);
		} else if (document.all){
			var elem = document.all[Elem];
		}
		xPos = elem.offsetLeft;
		tempEl = elem.offsetParent;
  		while (tempEl != null) {
  			xPos += tempEl.offsetLeft;
	  		tempEl = tempEl.offsetParent;
  		}
		return xPos;
	}
}

//Retourne la position Y de l'éléménet
function getElementTop(Elem) {
	if (ns4) {
		var elem = getObjNN4(document, Elem);
		return elem.pageY;
	} else {
		if(document.getElementById) {	
			var elem = document.getElementById(Elem);
		} else if (document.all) {
			var elem = document.all[Elem];
		}
		yPos = elem.offsetTop;
		tempEl = elem.offsetParent;
		while (tempEl != null) {
  			yPos += tempEl.offsetTop;
	  		tempEl = tempEl.offsetParent;
  		}
		return yPos;
	}
}