$(document).ready(function(){
	$('#mainNav li').bind('mouseover',switchSubNav);	
});

//切换横向二级菜单
function switchSubNav(event){
		var current = $(event.target).text();
							$('.subNav').children().css('display','none');
					  		if(event.currentTarget.nodeName == "LI"){					  		
					  		switch(current){
					  			case "定购":
					  				$('#subNavCon').stop();
					  				$('#xg').slideDown('fast');					  				
					  				break;
					  			case "行业和应用":
					  				$('#subNavCon').stop();
					  				$('#hy').slideDown('fast');										
					  				break;
									case "合作":
					  				$('#subNavCon').stop();
					  				$('#oem').slideDown('fast');										
					  				break;
								case "":
									break;
					  			default:
					  				$('#subNavCon').stop();
					  				$('#xz').slideDown('fast');	
					  				break;
								}
							}
							
							if ( event && event.stopPropagation )
							//因此它支持W3C的stopPropagation()方法
							event.stopPropagation();
							else
							//否则，我们需要使用IE的方式来取消事件冒泡
							window.event.cancelBubble = true;
							return false;	
											
}