how to prevent web page refreshing
<p>I have a "CaptchaControl" in a webusercontrol, when i click refresh link for the captcha code, the page refresh too. how can i prevent it?</p>

<pre><code>&lt;cc:CaptchaControl ID="captcha" CssClass="toppading" runat="server"  CharCount="5"  ImageUrl="~/images/CapchaImage.jpg" /&gt; 

   &lt;asp:LinkButton CssClass="leftpading" id="btnReset" runat="server" Text="Refresh" resourcekey="lblrefresh" OnClick="btnReset_Click" &gt;&lt;/asp:LinkButton&gt;


protected void btnReset_Click(object sender, System.EventArgs e)
{
    captcha.Refresh();
}
</code></pre>

<p>i've heard something about ajax, but i'm green in ajax.</p>
