Javascript - Cancel Postback In Linkbutton When Binding To Jquery Click Event?

I have a linkbutton to which i am binding to the click event using jQuery, however the page still posts back no matter what i try...

According to this i should be able to use event.preventDefault However nothing seems to work and it always posts back, but i do get the alert

Here is my example

<asp:LinkButton runat="server" Text="TEST" ID="lnkTest"></asp:LinkButton>
<script>
$(document).ready(function () {
var lnk = $('#<%=this.lnkTest.ClientID %>');
lnk.unbind('click.test').bind('click.test', function (event) { alert("Click"); event.preventDefault(); event.stopPropagation(); return false; });
});
</script>
UPDATE

Okay after some further investigation it seems that this does work as expected when i run it in a standalone page, however we are using this script, and it appears that it is causing a conflict..

That script moves any href='javascript:... into the click handler, im guessing that the order the handlers are assigned may have something to do with it...