function ConfirmSelection(frm) 
{ 
   for (i=0; i   { 
     //chkSubjectOfInterest is the id of your checkbox control
  
     if (frm.elements[i].name.indexOf('chkSubjectOfInterest') !=-1) 
     { 
       if (frm.elements[i].checked) 
       { 
         return true
       } 
     } 
   } 
   alert('You havent selected an Item yet!')
   return false
}