Probably something to do with this bit:
Code:
window.addEvent('domready', function(){
var myMenu = new ImageMenu($$('#imageMenu a'),{openWidth:600, border:2, onOpen:function(e,i){alert(e);}});
});
Which changes all links inside imageMenu to alert the link it goes to, instead of proceeding. I'm not too good with this sort of thing, but since it's the only part of the code with "alert" in it, it seems logical that this is the bit causing the problem.
Just take out the alert bit, put something else in its place (don't know what) and it should fix it.
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