asp image button refreshes page
<p>Hi My web page has lots of imageButtons, which refresh the page on click. How do I prevent this?</p>

<pre><code> var imageButton = new ImageButton();
    imageButton.ImageUrl = "Styles/unClicked.png";
    imageButton.ID = "btn" + questionName;
     imageButton.OnClientClick = ("javascript:button_pressed()");
</code></pre>
