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 //plugin  
        jQuery.pageLoad = function (handler) {
            Sys.Application.add_load(function loadHandler() {
                handler();
                Sys.Application.remove_load(loadHandler);
            });
        };

        //usage with anonymous function or named
        $.pageLoad(function () {
            //execution here 
            debugger;
            var chk = $find("<%=rdContributor.ClientID%>");

        });