function open_pup(url, win_width, win_height) {
var win_width = win_width;
var win_height = win_height;
var parameters = "left=0,top=0,toolbar=no,menubar=no,scrollbars=no,resizable=no,width=" + win_width + ",height=" + win_height;
var newWindow = window.open(url,'popWin',parameters);
newWindow.focus();
}