function popUp(URL) {
day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=1,scrollbars=1,location=0,statusbar=1,menubar=0,resizable=1,width=600,height=600,left = 340,top = 200');");
}
<!--<A HREF="javascript:popUp('../construction/under_construction.htm')">Open the Popup Window</A>-->

<!-- Script Size:  0.73 KB  -->