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 2 {  
 3    var tb = document.getElementById("ctl00_ContentPlaceHolder1_chkYear"); 
 4
 5    for(var i=0;i < tb.rows.length;i++)         
 6    {
 7       var chk = tb.rows[i].firstChild.firstChild;
 8       alert(chk == event.srcElement);
 9       if(chk != event.srcElement)                 
10       {  chk.checked = false;}         
11    }     
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 2    {         
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 5    {
 6        for(var j =0; j < tb.rows[i].cells.length; j++)
 7        {
 8          var chk = tb.rows[i].cells[j].firstChild;
 9          if(chk!= null && chk != event.srcElement)               


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    When web pages or applications begin to feel slow, analyzing assets as they come over the wire and profiling scripts while they are running allows you to focus your optimization efforts where they are needed most.
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