function popup(url_racine,url,titre,winname,x,y,scroll){

	var pop;
	var truex=(x*2)-(x-10)+20;
	var truey=(y*2)-(y-32)+30;
	var winl=(screen.availWidth-truex)/2;
	var wint=(screen.availHeight-truey)/2;
	var url_page=url_racine + "popup.php3?fichier=" + url+ "&titre=" + titre;

	pop=window.open(url_page,winname,'width='+x+',height='+y+',left='+winl+',top='+wint+',scrollbars='+scroll+',location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no');
	pop.moveTo(winl,wint);
	pop.resizeTo(truex,truey);
}