JQuery accordion menu / IE7 problem

JavaScript
1

I’m having an issue with a jQuery script with IE7. The script (adapted from one created by Marco van Hylckama Vlieg) is simple:

function accordionMenu() {
  $('#accordion ul').hide();
  $('#accordion li').click(
    function() {
      var checkElement = $(this).next();
      if((checkElement.is('ul')) && (checkElement.is(':visible'))) {
        return false;
        }
      if((checkElement.is('ul')) && (!checkElement.is(':visible'))) {
        $('#accordion ul:visible').slideUp('normal');
        checkElement.slideDown('normal');
        return false;
        }
      }
    );
  }
$(document).ready(function() {accordionMenu();});

Basically an accordion effect, which can be seen here: beprepared.hillphoenix.com/sessions.html
Click on the italicized text in the main content area.

The only message I see in IE7 is “Error on Page”. Of course, I’m a Mac user, so I have to bother coworkers to check the page on their PCs.

This works fine in every other browser I’ve tested, including IE8. What am I missing? What do I fix?

thanks in advance!

2

I can confirm that on Vista, it works in IE8 but doesn’t work in compatibility mode (IE7).

Can you please fix the HTML validation errors, and then try again.

3

Works fine here in IE 7 on Windows XP, 3:49 PM, local time !!

4

Thanks to both for your help. Will check the validation, and double-check on the OS used by the client in question.