Onclick not firing in asp.net

Hi friends,

I have  a web form in which it displays the list of items. Wen i click the next button, the onclick event written is not firing to the code in the code page.

The code in HTML is:

<TD align="center" width="233" bgColor="gold" colSpan="1" rowSpan="1">
<asp:LinkButton id="hrefFirst" onclick="ShowFirst" Runat="server" BackColor= Go to the complete details ...