$(document).ready(function() {
		$('.mainNav').children('ul.selectNav').hide();
		$('.mainNav').children('li').hover(
			function(event) {
				$(this).children('.selectNav').show();
				event.stopPropagation();
				$('.selectNav').hover(
					function(event){
						 $(this).show();
						 $(this).style('filter','Alpha(Opacity=80)');
					},
					function(event){
						 $(this).show();
						 $(this).style('filter','Alpha(Opacity=80)');
					}
				)
			},
			function(event) {
				$(this).children('.selectNav').hide();
				event.stopPropagation();
			}
		);
		
		
		$('#menu_list').children('li').hover(
			
			function(event){
				$(this).attr('class','menu_yes');
				event.stopPropagation();
				},
			function(event){
				$(this).attr('class','menu_no');
				event.stopPropagation();
				}
											 
		);
			   
})


function changeMenu(id){
    for(i=1;i<=5;i++){
	    menu_item='#menu_'+i;
		if(id==i){
		   $(menu_item).attr('class','menu_yes'); 	
		}else{
		   $(menu_item).attr('class','menu_no');	
			}
	}	 
}