Plugin doesn't work in IE 7. Any ideas?

Plugin doesn't work in IE 7. Any ideas?

I've tested this plugin in in every browser I can get my hands on (Opera, Firefox, Safari, IE), and on both Windows and Macs to boot, and it works in every single one except for IE 7. I cannot, for the life of me, figure out why.

The code is below, but if you want to check it out in inaction, just go here and view it with IE 7 (or IE 8 in compatibility mode).

Any help would be greatly appreciated (also, this is my first jQuery plugin, so, even though it technically works, I could use some tips on making it better, too).

Thanks in advance.

jQuery.fn.panelize = function(options){    
   
   var defaults = {
      hover:       "over",
      open:       "open",
      speedShow:    1000,
      speedHide:   750,
   };
   var options = $.extend(defaults, options);
      
   var panel = $(this).find('#panel');
   var width = $(this).width();
   var panels = new Array();
   
   panel.each(function() {
      var name    = $(this).attr("class");
      var height   = $(this).height();   
      panels[name] = height;   
      $(this).hide().css({"height": 0}, {"width" : width });
   });
   
   var tab = $(this).find('#tab');
   
   tab.each(function(){
      $(this).css({ "cursor" : "pointer" });
   });
   
   tab.bind("click", function(event) {
   
      var node = $(this);
      var next = node.next();
   
      if( node.hasClass(options.open) ){
         node.toggleClass(options.open);
         next.animate({height: 0}, {duration: options.speedHide, complete : function(){
            next.hide();         
         } });
      }
      else {
         var name = node.attr("class");
         var height = panels[name];
         node.toggleClass(options.open);
         next.show().animate({height: height}, {duration: options.speedShow});
      }
   
   });

}