In dev/sane onemouseover is broken, double-check in 1.0:

Now, with the latest release (/dev/sane), onemouseover() seems broken;

here's the code;

$("#welcome img").mouseover(function(){ // WHY IS onemouseover broken ??

$("#logo").html('<img src="images/logo/border.gif">');

});

NOTE: I switched to .mouseover() to restore functionality.