jQuery.fn.Menu = function(params) {
   return this.each(function() {
      var $wrapper = $(this);
      var $list = $('div',$wrapper);
      var $trigger = $('.trigger',$wrapper);
   
      $wrapper.bind("mouseenter",function(e) { $list.show(); });
      $wrapper.bind("mouseleave",function(e) { $list.hide(); });
      
      if (params.hoverClass!='' && params.nohovClass!='') 
         $trigger.hover(
            function() { this.className = params.hoverClass; },
            function() { this.className = params.nohovClass; }
         );
   });
}


$(document).ready(function(){
     
   $('.menu_wrapper').Menu({
      nohovClass: "trigger",
      hoverClass: "trigger_hover"
   });
   
});