function popup(url,name,width,height) {
	var top=(screen.height-height)/2;
	var left=(screen.width-width)/2;
	fencent=window.open(url,name,"top="+top+",left="+left+",width="+width+",height="+height+",status=no,scrollbars=no,resizable=no");
}

function popup2(url,name,width,height) {
	var top=(screen.height-height)/2;
	var left=(screen.width-width)/2;
	fencent=window.open(url,name,"top="+top+",left="+left+",width="+width+",height="+height+",status=no,scrollbars=yes,resizable=no");
}
function popup_centre(url,largeur,hauteur){
	var pos_vertical=(screen.height/2)-(hauteur/2);
	var pos_horizontal=(screen.width/2)-(largeur/2);
	var fenetre='height='+hauteur+',width='+largeur+',top='+pos_vertical+',left='+pos_horizontal;
	window.open(url,'',fenetre);
}