jQuery-1.2.6.min.js - Internet Explorer error

jQuery-1.2.6.min.js - Internet Explorer error

Hi

I hope someone is able to help me or point me in the right direction.

Using Coda slider - which works great in Firefox but noticed in IE8 it's showing an error on the page:

Invalid Argument
jQuery-1.2.6.min.js
Code: 0
Line: 12
Char: 2299
[Path to js file]

Here is a copy of the markup in the HEAD that calls all the JavaScript files:

  1.   <script type="text/javascript" src="<%=SiteRoot()%>include/jquery-1.2.6.min.js"></script>
      <script type="text/javascript" src="<%=SiteRoot()%>include/jquery-easing-1.3.pack.js"></script>
      <script type="text/javascript" src="<%=SiteRoot()%>include/jquery-easing-compatibility.1.2.pack.js"></script>
      <script type="text/javascript" src="<%=SiteRoot()%>include/coda-slider.1.1.1.pack.js"></script>
      <script type="text/javascript">

          var theInt = null;
          var $crosslink, $navthumb;
          var curclicked = 0;

          theInterval = function(cur) {
              clearInterval(theInt);

              if (typeof cur != 'undefined')
                  curclicked = cur;

              $crosslink.removeClass("active-thumb");
              $navthumb.eq(curclicked).parent().addClass("active-thumb");
              $(".stripNav ul li a").eq(curclicked).trigger('click');

              theInt = setInterval(function() {
                  $crosslink.removeClass("active-thumb");
                  $navthumb.eq(curclicked).parent().addClass("active-thumb");
                  $(".stripNav ul li a").eq(curclicked).trigger('click');
                  curclicked++;
                  if (7 == curclicked)
                      curclicked = 0;

              }, 5000);
          };

          $(function() {

              $("#main-photo-slider").codaSlider();

              $navthumb = $(".nav-thumb");
              $crosslink = $(".cross-link");

              $navthumb
                .click(function() {
                    var $this = $(this);
                    theInterval($this.parent().attr('href').slice(1) - 1);
                    return false;
                });

              theInterval();
          });
        </script>
      <script type="text/javascript" src="<%=SiteRoot()%>include/ANBookingFormValidation.js"></script>
      <script type="text/javascript" src="<%=SiteRoot()%>include/CommonFormFunctions.js"></script>
      <script type="text/javascript" src="<%=SiteRoot()%>include/calendarDateInput.js">
          /**********************************************
          * Jason's Date Input Calendar- By Jason Moon http://calendar.moonscript.com/dateinput.cfm
          * Script featured on and available at http://www.dynamicdrive.com
          * Keep this notice intact for use.
          ***********************************************/

        </script>
      <script type="text/javascript" src="<%=SiteRoot()%>include/AC_RunActiveContent.js"></script>



























































I have googled this issue for the last 2 hours and not found anything specific, hoping someone has come across something like this before, as I have no idea about JavaScript!

I tried calling the latest jQuery version (v1.5.2) but to no avail...

Thanks in advance to whoever can help me!!!!