// Fonction pour creer une requête Ajax.
function creerRequete() {
	try {
		requete = new XMLHttpRequest(); 
	} catch (microsoft) {
		try {
			requete = new ActiveXObject('Msxml2.XMLHTTP');
		} catch(autremicrosoft) {
			try {
				requete = new ActiveXObject('Microsoft.XMLHTTP');
			} catch(echec) {
				requete = null;
			}
		}
	}
	if(requete == null) 
		alert('Votre navigateur ne semble pas supporter les objets XMLHttpRequest.');
}

// Fonction qui affiche un message d'alert.
function openAlert(msg,tailleAlert){
	Dialog.alert("<table border='0' cellspacing='0' cellpadding='0' align='center'><tr><td align='center' height='70' valign='top'><img src='images/FR-fr/forms/warning.png'></td></tr><tr><td>"+msg+"</td></tr></table>", {className:"alphacube", width:400, height:tailleAlert, okLabel: "OK", ok:function(win) {return true;}});
}

// Fonction pour afficher le nombre de caractères restants.
var ns6=document.getElementById&&!document.all
function restrictinput(maxlength,e,placeholder){
	if (window.event&&event.srcElement.value.length>=maxlength)
		return false
	else if (e.target&&e.target==eval(placeholder)&&e.target.value.length>=maxlength){
		var pressedkey=/[a-zA-Z0-9\.\,\/]/
		if (pressedkey.test(String.fromCharCode(e.which)))
			e.stopPropagation()
	}
}

function countlimit(maxlength,e,placeholder){
	var theform=eval(placeholder)
	var lengthleft=maxlength-theform.value.length
	var placeholderobj=document.all? document.all[placeholder] : document.getElementById(placeholder)
	if (window.event||e.target&&e.target==eval(placeholder)){
		if (lengthleft<0)
			theform.value=theform.value.substring(0,maxlength)
		placeholderobj.innerHTML=lengthleft
	}
}

function displaylimit(thename, theid, thelimit, text){
	var theform=theid!=""? document.getElementById(theid) : thename
	var limit_text='<b><span id="'+theform.toString()+'">'+thelimit+'</span></b> '+text+'.'
	if (document.all||ns6)
		document.write(limit_text)
	if (document.all){
		eval(theform).onkeypress=function(){ return restrictinput(thelimit,event,theform)}
		eval(theform).onkeyup=function(){ countlimit(thelimit,event,theform)}
	}
	else if (ns6){
		document.body.addEventListener('keypress', function(event) { restrictinput(thelimit,event,theform) }, true);
		document.body.addEventListener('keyup', function(event) { countlimit(thelimit,event,theform) }, true);
	}
}

// Chack du scrolling Y --- met à jour la hauteur du menu de gauche
var scrollPositionY = 0;
Event.observe(window, "scroll", function(ev) {
        var currentScrollPositionY = getScrollPositionY();
        if (scrollPositionY != currentScrollPositionY) {
            scrollPositionY = currentScrollPositionY;
            if ($('leftMenuSpacer')) {
				$('leftMenuSpacer').style.height = Math.max(0, scrollPositionY - 170)+"px";
            }
        }
    });

function getScrollPositionY() {
    if (Prototype.Browser.IE) {
		return (document.documentElement.scrollTop || document.body.scrollTop);
	}
	// pour firefox
	else {
		 return pageYOffset;
	}
}