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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    {         
 3    var tb = document.getElementById("CheckBoxList1");
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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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