VS 2010 Invoking webpage submit button

Hi all,

I am having a bit of trouble invoking a button without any id or tag name from a webpage.

Here is the html code.

<div class="sbSubmit"><ul class="buttons floatRight" style='display:none;'><li class="btn" onclick="if ( validateSb() ) doLinkSubmit('../ha/default.aspx');return false;"/><div class="prettyBtn primaryBtn"> <span> Search </span></div>

Any suggestions on how to invoke the clicking of this button?

Thanks in advance.