<script language="javascript" type="text/javascript">
$(document).ready(function() {
$("#TextBox1").click(function() { alert("bla bla bla bla bla") });
});
</script>
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</asp:ToolkitScriptManager>
<asp:TabContainer runat="server" ActiveTabIndex="0">
<asp:TabPanel runat="server" HeaderText="Easd">
<ContentTemplate>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</ContentTemplate>
</asp:TabPanel>
<asp:TabPanel runat="server" HeaderText="asdasd">
<ContentTemplate>
asd</ContentTemplate>
</asp:TabPanel>
</asp:TabContainer>
i need TextBox1 access