I have 2 dropdown lists on my webform and using jquery trying to filter/reset filter 2nd dropdown elements based on 1st dropdown selection.

$(document).ready(function()
{
       $('#dropdown1').change(function(e)
       {
            switch ($(this).val())
            {
                 case "4":
                 //this removal works
                 $('#dropdown2').filter(function()
                    {
                        return ($(this).val() == 16);

                    }).remove();
                    break;


                 .................    
                 default:
                 //how would I restore filter here? 

            }

       }

});

Removing part works, so it filters item with no problem, but I have difficulty restoring the filter on dropdown 2 if something else is chosen in dropdown 1. I was trying to use .hide() and .show() instead of .remove() but it doesn't seem to work on IE6 at least.