function Popup(URL) {
var left;
var top;
top = ((screen.height -700) / 2);
left = ((screen.width - 850) / 2);
win  = window.open(URL, "webgalery", "toolbar=0,scrollbars=0,location=0,status=0,menubar=0,directories=0,resizable=0,width=850,height=700,left="+left+",top="+top+"")}