Javascript is not working in asp.net user control

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C#

ASP.NET

JScript.NET

I have a user control with many javascript functions. When I am adding this to my project ,some of the fuctions are working properly but some not.
I am using the below script for keypress event of a textbox

<script type="text/javascript">
                        var to; // variable to which we assign setTimeout function
                        var prm = Sys.WebForms.PageRequestManager.getInstance(); // Page Request Manager object

                        function onTxtKeyUp(e, buttonid) {

                            if (e.KeyCode != 9)
                                to = setTimeout(function () {
                                    performSearch(buttonid);
                                }, 300)
                        }
                        function onTxtKeyDown() {
                            if (to) clearTimeout(to);
                        }
                        function performSearch(buttonid) {

                            if (prm.get_isInAsyncPostBack) {
                                prm.abortPostBack();
                            }

                            //             $get("<%=lblStatus.ClientID %>").innerHTML = "Loading...";
                            __doPostBack(buttonid, "");
                            //           __doPostBack("<%=btnSearch.UniqueID %>", "");
                        }
                  </script>

and its working properly. the next I am using for a doubleclick is

<script type="text/javascript">
    function clickButton(e, buttonid) {
        debugger;
        var evt = e ? e : window.event;
        var bt = document.getElementById(buttonid);
        if (bt) {
            bt.click();
        }
    }
      </script>

and it is not working