window.onload = function(){
	var links = document.getElementById('menu').getElementsByTagName('a');
	for(i=0;i<links.length;i++){
		links[i].onmouseover = function(){
			var menus = document.getElementById('submenu').getElementsByTagName('ul');
			for(j=0;j<menus.length;j++)menus[j].style.display='none';
			if(this.rel!='') document.getElementById('menu-'+this.rel).style.display = 'block';
		}	
	}
}