function showImage(URL)
  {
    ww = Math.floor(640*1.5);
    wh = Math.floor(400*1.9);
    imgwindow = window.open(URL,"imgwindow","location=no, menubar=no, resizable=yes, scroll=auto, width="+ww+", height="+wh);
    if ( imgwindow ) 
    {
    	imgwindow.focus();
	    return false;
	}
	return true;
  }