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function getURL()  
      {          
          
          var objDiv=document.getElementById ("show");
          var objs=objDiv.childNodes;
          for(var i=0;i<objs.length;i++)
          {
              if(objs.tagName=="A")
              {
                  var objA=objs;
                  var url=objA.href;
                  var xmlhttp =new ActiveXObject("microsoft.XMLHTTP");  
                  xmlhttp.open("HEAD",url,false);  
                  xmlhttp.send();  
                  if(xmlhttp.readyState==4)            
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