function menu(id){
	if (!document.getElementById || !document.getElementsByTagName)
		return false;
	this.menu = document.getElementById(id);
	this.submenus = this.menu.getElementsByTagName("li");	
}
menu.prototype.init = function() {	
	for (var i = 0; i < this.submenus.length; i++){	 
	   this.submenus[i].onmouseover = function(){
	      if(this.getElementsByTagName("table")[0])
	         this.getElementsByTagName("table")[0].style.display = 'block';
	   };
	}
   for (var i = 0; i < this.submenus.length; i++){
      this.submenus[i].onmouseout = function(){
         if(this.getElementsByTagName("table")[0])
            this.getElementsByTagName("table")[0].style.display = 'none';      
      };
   }
};