function popupWindow(location, width, height) {
   if (!width) { width = 600 }
   if (!height) { height = 400 }

   newWindow = window.open("","PopupWindow", "width="+width+", height="+height+", top=50, left=50, scrollbars=yes, resizable=yes");   
   newWindow.document.location=location;
   newWindow.window.focus();
}