Hello Rick,

the easiest way is to do it using good old client-side javascript

<input type="button" id="btnOpenWindow" value="Open it!" onclick="btnOpenWindow_onclick()">

<SCRIPT language="javascript">

   function btnOpenWindow_onclick()
   {
        window.open("yourother.aspx")
   }

</SCRIPT>

You might like to have a look at the
window.open()
window.showModalDialog() and
window.showModelessDialog() methods
at
http://msdn.microsoft.com/library/default.asp?url=/workshop/author/dhtml/reference/objects/obj_window.asp
for the different ways to open a window using javascript.

Hope that helps,
Alex