var overTimer=null;
var overTimev=200;
function sub_change(tabNumber,shuliang,nav_name,sub_name,style_name){
for (i = 1; i <= shuliang; i++) {
        document.getElementById(sub_name + i).style.display = 'none';
	document.all[nav_name+i].className=style_name+i+"_off";
}
      	document.getElementById(sub_name + tabNumber).style.display = '';
	document.all[nav_name+tabNumber].className=style_name+tabNumber+"_on";
	  
}

//阿弥陀佛~~~说明就一下
//tabNumber 	本导航数字ID号
//shuliang	切换导航按纽数量
//nav_name	导航名字前缀
//sub_name	导航相对应的div的名字前缀
//style_name 	样式名称前缀
//