truc = false;
function pop(photo) {
if(!truc || truc.closed)
truc = window.open('','','width0,height0,resizable=1');
truc.document.open()
truc.document.write('<img src="'+photo+
'" onload="window.resizeTo(this.width+20,this.height+20)">');
truc.document.close();
truc.focus();
}