Tabs: tabs with an empty href are enabled in IE6/7

As per this forum thread

http://forum.jquery.com/topic/jquery-ui-tabs-and-ie

(feel free to move this to jquery core if its more appropriate)

I had the same issue. I think I have a good idea why this is happening. It appears that the tabs plugin is using the jquery.inArray() method and expecting the return response to be -1 if the value is not found. This works as expected in other browsers, but IE is returning undefined. I think this is more an issue with the inArray method in jquery core. A simple patch to the method in the core would solve the problem, and is probably the way to go, but I felt more comfortable patching the tabs plugin. My solution is as follows:

Somewhere around line # 7051 in the combined version of ui code is:

// disable tabs
  for (var i = 0, li; (li = this.lis[i]); i++) {
   $(li)[$.inArray(i, o.disabled) != -1 &&
    !$(li).hasClass('ui-tabs-selected') ? 'addClass' : 'removeClass']('ui-state-disabled');
  }

I added a check for the undefined value, replacing the above code with:

 for (var i = 0, li; (li = this.lis[i]); i++) {
   $(li)[$.inArray(i, o.disabled) != -1 && $.inArray(i, o.disabled) != undefined &&
    !$(li).hasClass('ui-tabs-selected') ? 'addClass' : 'removeClass']('ui-state-disabled');
  }

and everything worked in IE as expected.

Hope this helps.