changeOpacity(80, "div_conteneur_fond");

function changeImage(idObject,imgName,state)
{
	eval("document.getElementById(idObject).src="+imgName+"_"+state+".src");
}

function changeOpacity(opacity, idObject)
{
	var object = document.getElementById(idObject).style;
	object.opacity = (opacity / 100);
	object.MozOpacity = (opacity / 100);
	object.KhtmlOpacity = (opacity / 100);
	if(navigator.userAgent.toLowerCase().indexOf("msie") != -1) object.filter = "alpha(opacity=" + opacity + ")";
}

function ecrire_cookie(nom, valeur, expires)
{
	var myDate=new Date();
	myDate.setTime(myDate.getTime()+(expires*24*60*60*1000));
	document.cookie=nom+"="+escape(valeur)+((myDate==null) ? "" : ("; expires="+myDate.toGMTString()));
}

function arguments_cookie(offset)
{
	var endstr=document.cookie.indexOf (";", offset);
	if (endstr==-1) endstr=document.cookie.length;
	return unescape(document.cookie.substring(offset, endstr)); 
}

function lire_cookie(nom)
{
	var arg=nom+"=";
	var alen=arg.length;
	var clen=document.cookie.length;
	var i=0;
	while (i<clen)
	{
		var j=i+alen;
		if (document.cookie.substring(i, j)==arg) return arguments_cookie(j);
		i=document.cookie.indexOf(" ",i)+1;
		if (i==0) break;
	}
	return null; 
}