function BigImageReset(url)
{
   var maxWidth=500;
   var img=new Image();
   img.src=url;
   
   if(img.width>maxWidth)
   {
       document.write("<a href=\""+url+"\" target=\"_blank\"><img src=\"url\" width=\""+maxWidth+"\" border=\"0\" /></a>");
   }
   else
   {
       document.write("<img src=\""+url+"\" />");
   }
}