KeyDown event is not firing second time
<p>In my masterpage, i'm having one textbox for searching purpose. if we press enterkey it is redirecting to some otherpage. But it is happening only one time. next time when i enter some text and press enter key, it is not going to the Keydown event handler.</p>

<p>Code: </p>

<p>javascript Code:</p>

<pre><code> function SearchQuestionsAndDisplay(txt, event) {
            if (event.keyCode == 13) {
                document.location = "BrowserAddOn.aspx?SearchString=" + escape(txt.value);
             }
            return false;
        }
</code></pre>

<p>Text Box:</p>

<pre><code> &lt;asp:TextBox ID="SearchTextBox" runat="server" Text="Search" AutoPostBack="true"  
onkeyup = "return SearchQuestionsAndDisplay(this,event)"                                CssClass="searchtxtbox" /&gt;
</code></pre>

<p>Please suggest me what i need to do. pl let me know if there is anything missing in my code.</p>
