function change1(e) {
   if(window.event) e = window.event;
       var a=e.srcElement?e.srcElement:e.target;
       if (a.tagName=="IMG"){
       if(a.src.substring(a.src.length-6,a.src.length-4)=="_x")
           a.src=a.src.substring(0, a.src.length-4) + "2"+
           a.src.substring(a.src.length-4, a.src.length);
   }
}
function change2(e) {
   if(window.event) e = window.event;
       var a=e.srcElement?e.srcElement:e.target;
       if (a.tagName=="IMG"){
       if(a.src.substring(a.src.length-7,a.src.length-5)=="_x")
           a.src=a.src.substring(0, a.src.length-5) +
           a.src.substring(a.src.length-4, a.src.length);
   }
}
document.onmouseover=change1;
document.onmouseout=change2;