Improve performance of this jquery script
This runs fast compared to other's.But i dont know how fast it would be at slow computers..
The code filters the results dymanically. The criteria are set in css class..

        $(document).ready(function ()
    {
    
       
        $("#filters a").click(function(event)
        {
            event.preventDefault();
            event.stopPropagation();
            if($(this).hasClass("checked"))
            {
                $(this).removeClass("checked");
            }
            else if(!$(this).hasClass("disabled"))
            {
                $(this).addClass("checked");
            }
            else
                {
                    return false;
                }
        
        
            var results=$("#products li");
            results.hide();
            $("#filters li.filtersGroup a").removeClass("disabled");
            $("#filters li.filtersGroup").each(function(index) {
                var classes="";
                
                $(this).find("a.checked").each(function(index) {
                    classes=classes+ "." + $(this).attr("id") +",";
                });
                if(classes=="") return true;
            
                results=results.filter(classes.substr(0,classes.length-1));
    //periorismos
                    $("#filters li.filtersGroup").not($(this)).each(function (index){
                        $(this).find("a").each(function(index) {
   

                    if(results.filter("." + $(this).attr("id")).length<=0) {
                           $(this).removeClass("checked").addClass("disabled");
                       }
                       
                });
                

             
            });
        });
        results.show();
   
                     

    })
});

Any ideas how to improve it? Also what can i do about preventdefault (itsnot triggered if the whole document isnt loaded,because this may be a problem for impacient people..
Improve performance of this jquery script
===

This runs fast compared to other's.But i dont know how fast it would be at slow computers..
The code filters the results dymanically. The criteria are set in css class..

        $(document).ready(function ()
    {
    
       
        $("#filters a").click(function(event)
        {
            event.preventDefault();
            event.stopPropagation();
            if($(this).hasClass("checked"))
            {
                $(this).removeClass("checked");
            }
            else if(!$(this).hasClass("disabled"))
            {
                $(this).addClass("checked");
            }
            else
                {
                    return false;
                }
        
        
            var results=$("#products li");
            results.hide();
            $("#filters li.filtersGroup a").removeClass("disabled");
            $("#filters li.filtersGroup").each(function(index) {
                var classes="";
                
                $(this).find("a.checked").each(function(index) {
                    classes=classes+ "." + $(this).attr("id") +",";
                });
                if(classes=="") return true;
            
                results=results.filter(classes.substr(0,classes.length-1));
    //periorismos
                    $("#filters li.filtersGroup").not($(this)).each(function (index){
                        $(this).find("a").each(function(index) {
   

                    if(results.filter("." + $(this).attr("id")).length<=0) {
                           $(this).removeClass("checked").addClass("disabled");
                       }
                       
                });
                

             
            });
        });
        results.show();
   
                     

    })
});

Any ideas how to improve it? Also what can i do about preventdefault (itsnot triggered if the whole document isnt loaded,because this may be a problem for impacient people..