var popWindow;

function ShowPopWindow(url, width, height)
{
 if (!popWindow || popWindow.closed)
 {
  popWindow = window.open(url, "", "resizable=no, scrollbars=no, width="+width+", height="+height+"");
 }
 else
 {
  popWindow.close();
  popWindow = window.open(url, "", "resizable=no,  scrollbars=no, width="+width+", height="+height+"");
 }
 return false;
}