$(document).ready(function() {
		$('.mainNav').children('ul.selectNav').hide();
		$('.mainNav').children('li').hover(
			function(event) {
				$(this).children('.selectNav').show();
				$(this).children('span').attr("class","span_now");
				event.stopPropagation();
				$('.selectNav').hover(
					function(event){
						 $(this).show();
					},
					function(event){
						 $(this).show();
					}
				)
			},
			function(event) {
				$(this).children('.selectNav').hide();
				$(this).children('span').attr("class","");
				event.stopPropagation();
			}
		);
		
		
			   
})