function roll_over(img_name, img_src)
   {
   document[img_name].src = img_src;
   }
   
   
   
function popupimg(Url,width,height){


prevW = window.open("","newWin","width="+width+",height="+height+",top=140,left=200,toolbar=0,location=no,directories=0,status=0,menubar=0,scrollbars=0,resizable=1"); 


prevW.document.write('<table border="0">   <tr ><td colspan="3"><img src='
+Url+
 'onClick="javascript:window.close();"></td></tr> <tr><td align="left"></td><td align="center"></td><td align="right"></td></tr></table>');
prevW.document.close();
prevW.focus()
}