Pass parameter in modal popup

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SharePoint2010

I am trying to open a modal dialog as result of client click. The issue is not being able to pass a parameter in the click event. If I don't use a link button it will work, but I need to be able to use the link button do to other requirements.

This works:

<a class="linkoff" onmouseover="this.className = 'linkon'"  önmouseout="this.className='linkoff'">
        id="A4"  önclick="javascript:OpenAssignDialog'<%=BIN %>'); return false;"  href="#">Add to Dreamsheet</a>

This doesn't:

<asp:LinkButton runat="server" ID="lbAddDS" OnClientClick="javascript:OpenAssignDialog('<%=BIN %>'); return false;"  Text="Add">

I am trying to pass the BIN variable