Well, not without scripting again I'm afraid.
1. You'll need to have a button that opens the pop-up because othervise it will be not recognized as a pop-up. This has to be on-click pop-up (select pop-up layer in the Link tab "Popup layer" field).
2. Give this button following name: "my_aop".
3. Insert following code in the placeholder on the page:
Code:
<script type="text/javascript">
var my_aop_oldload=window.onload;
window.onload=my_aop_load;
function my_aop_load(e)
{if(my_aop_oldload)my_aop_oldload(e);
var o=document.getElementById('my_aop');
if(o.href)window.open(o.href,'_self');};
</script>
Note, that you can actually use any unique name for that button by changing it in the code (highlighted in red).
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