function popup(adr, name, width, height, is_scrollbar) {
	if (typeof(name) != "undefined") {
		name = "popup";
	}
	if (typeof(width) != "undefined") {
		width = screen.width;
	}
	if (typeof(height) != "undefined") {
		height = screen.height;
	}
	if (typeof(is_scrollbar) != "undefined") {
		is_scrollbar = "true";	
	}
	var largeur=screen.availWidth;
    var hauteur=screen.availHeight;
    var demiL=((largeur-width)/2);
    var demiH=((hauteur-height)/2);
    name = window.open(adr,name,'scrollbars='+is_scrollbar+',screenX=0,screenY=0,status=0,location=0, menubar=0,toolbar=0,resizable=0,width='+width+',height='+height+',top='+demiH+',left='+demiL);
}