Radtreeview giving alert should select a category even its selected

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Javascript

Hi ,

I got an issue in java script, even though i selected all the nodes by selecting the selecAll checkbox iam getting error.

My code is as below:

<script type="text/javascript" language="javascript">
            //Check for empty categoryid
            function CheckForEmptyCate() {
                var tree = $find("<%= categoryTreeView.ClientID %>");
                if (Page_ClientValidate()) {
                    if (tree.get_checkedNodes().length == 0) {
                        alert("Please select atleast one Category.");
                        return false;
                    }
                }
            }
</script>

and iam using below code to select all the nodes

<script type="text/javascript" language="javascript">
         function checkUncheckAll(chk){
          //alert("test");
          $j('#<%=categoryTreeView.ClientID %>').find("input:checkbox").each(function(){
          if(this != chk){
          this.checked = chk.checked;
           }
          });
         }
        </script>

Please let me know where iam going wron.
Thanks in advance