(function($){
    $.fn.checkgroup = function(options){
        //merge settings
        settings=$.extend({
            groupSelector:null,
            groupName:'group_name',
            enabledOnly:false
        },options || {});
        
        var ctrl_box=this;

        
        //allow a group selector override option
        var grp_slctr = (settings.groupSelector==null) ? 'input[name='+settings.groupName+']' : settings.groupSelector;
        
        //grab only enabled checkboxes if required
        if(settings.enabledOnly)
        {
            grp_slctr += ':enabled';
        }

        //attach click event to the "check all" checkbox(s)
        ctrl_box.click(function(e){
            chk_val=(e.target.checked);
            $(grp_slctr).attr('checked',chk_val);
            //if there are other "select all" boxes, sync them
            ctrl_box.attr('checked',chk_val);
        });
        //attach click event to checkboxes in the "group"
        $(grp_slctr).click(function(){
            if(!this.checked)
            {
                ctrl_box.attr('checked',false);
            }
            else
            {
                //if # of chkbxes is equal to # of chkbxes that are checked
                if($(grp_slctr).size()==$(grp_slctr+':checked').size()){
                    ctrl_box.attr('checked','checked');
                }
            }
        });
        //make this function chainable within jquery
        return this;
    };                      
})(jQuery);