function popUp(url, options, windowW, windowH, center) {
day = new Date();
id = day.getTime();
if (center == "on")
{
var windowX = (screen.width/2)-(windowW/2);
var windowY = (screen.height/2)-(windowH/2);
eval("page" + id + " = window.open('" + url + "', " + id + ", '" + options + ",height=" + windowH + ",width=" + windowW + ",left=" + windowX + ",top=" + windowY + "');");
}
else
{
eval("page" + id + " = window.open('" + url + "', " + id + ", '" + options + ",height=" + windowH + ",width=" + windowW + "');");
}
}