var teacherImgSrc   = new Array();//图片地址 
var teacherIntro    = new Array();//介绍 
var teacherUrl      = new Array();//链接 
var teacherImgIntro = new Array();//链接 

  
		//teacherImgSrc[0]   = '/images/picSubbanner.jpg'; 
		//teacherUrl[0]      = '/news/2008/0710/news_11.html';
		
		teacherImgSrc[0]   = '/images/new_ad1.jpg'; 
		teacherUrl[0]      = ' http://wacomnews.shuweiban.com/2009/0902/news_29.html';
		 
		teacherImgSrc[1]   = '/images/new_ad2.jpg'; 
		teacherUrl[1]      = 'http://wacomnews.shuweiban.com/2009/0902/news_29.html';
		
		teacherImgSrc[2]   = '/images/new_ad3.jpg'; 
		teacherUrl[2]      = 'http://www.shuweiban.com/showroom/';
		 

var teacherNumber = Math.floor(Math.random()*teacherImgSrc.length);//随机函数 

document.write("<a href='"+teacherUrl[teacherNumber]+"'><img src='"+teacherImgSrc[teacherNumber]+"' title='"+ teacherImgIntro[teacherNumber] +"'/></a>");