function popup(theURL) {
var left;
var top;
top = ((screen.height -620) / 2);
left =	((screen.width - 420) / 2);
window.open(theURL, "", "toolbar=0,scrollbars=yes,location=0,status=0,menubar=0,directories=0,resizable=0,width=420,height=620,left="+left+",top="+top+"")
}