function openWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}
closetime = 0; // Close window after __ number of seconds?
// 0 = do not close, anything else = number of seconds

function Start(URL, WIDTH, HEIGHT) {
windowprops = "left=50,top=50,width=" + WIDTH + ",height=" + HEIGHT;
preview = window.open(URL, "preview", windowprops);
if (closetime) setTimeout("preview.close();", closetime*1000);
}

function doPopup() {
var increment = Math.floor(Math.random() * 2);
if (increment == 1) {
url = "http://www.yahoo.com";
width = 550;  // width of window in pixels
height = 400; // height of window in pixels
delay = 5;    // time in seconds before popup opens
timer = setTimeout("Start(url, width, height)", delay*1000);
}
}