function openPopup(url, popup_id, params){
	var popupTop = document.all ? top.screenTop:top.screenY;
	popupTop += parseInt(top.document.body.offsetHeight/2) - 105;
	var popupLeft = document.all ? top.screenLeft:top.screenX;
	popupLeft += parseInt(top.document.body.offsetWidth/2) - 195;
	var posparams = 'top='+popupTop+',left='+popupLeft;
	if(params != null && params != "") params = posparams + "," + params;
	else params = posparams;
	popup_id = new String(Math.round(Math.random() * 100000));
	var floater = window.open(url,popup_id,params);
	if (floater != null && floater.opener == null) floater.opener = self;
	return floater;
}
function open_Centered_window(LaPage, NomPage, Params, Haut, Larg) {
	var H = (screen.height - Haut) / 2 - 50;
	var L = (screen.width - Larg) / 2;
	var xParams = Params + ",height="+Haut+",width="+Larg+",top="+H+",left="+L;
	pop_up = window.open(LaPage,NomPage,xParams);
}
function change(e, color){
	var el=window.event? event.srcElement: e.target
	if (el.tagName=="INPUT" && ((el.type=="button")||(el.type=="submit")))
	el.style.backgroundColor=color
}