function CallMe(src,dest)
 {    
     var ctrl = document.getElementById(src);
     if(ctrl.value.length > 4)
     {
     // call server side method
     PageMethods.tbEmail_TextChanged(ctrl.value, CallSuccess, CallFailed, dest);
     }
 }
 
 // set the destination textbox value with the ContactName
 function CallSuccess(res, destCtrl)
 {    
     var dest = document.getElementById(destCtrl);
     dest.value = res;
 }
 
 // alert message on some failure
 function CallFailed(res, destCtrl)
 {
     alert(res.get_message());
 }
 
 function CallNick(src,dest)
 {    
     var ctrl = document.getElementById(src);
     if(ctrl.value.length > 2)
     {
     // call server side method
     PageMethods.tbEmail_TextChanged(ctrl.value, CallSuccess, CallFailed, dest);
     }
 }