//图片轮换
var ii = 1; //当前图片
var maximg = 3; //实际图片数量
//产品显示效果

function overdiv(value){
	for (var ii = 1; ii <=3; ii++){

		var showtext = document.getElementById("showtext" + ii);
		var showpic = document.getElementById("showpic" + ii);
		
		if( showtext==null || showpic==null) break;
		
		if(ii == value){
			showtext.style.display="none";
			showpic.style.display="block";
		}else if(ii != value){
			showtext.style.display="block";
			showpic.style.display="none";
		}
	}
}


 function shownav(m){//只显示自己，其余均隐藏


		var bb=document.getElementById("mainnav"+m);
		for(var i=1;i<=1;i++){
			if(i == m){	
			//alert(m);
				document.getElementById("subnav" + i).style.display = "block" ;
			}
			else
			{
				document.getElementById("subnav" + i).style.display = "none" ;
				}
		}		
	}