Call procedure in the Onclick of <area> in the Image Map in ASP.NET

Question

Good afternoon, I have this code:

<img src="../Image/sala.png" USEMAP="#sala" BORDER=0> 

<area name="window" shape="poly" coords="633,82,631,117,627,145,625,160,644,162,671" href=""  alt="window" title="" OnMouseOver="window.status='window'; return true" OnMouseOut="window.status=''; return true">

I have a sub in Vb that calls a dialog box that I wanted to be called in the above code onclick. Can anyone help me? Thanks :)