var p=2;  
var q=Math.floor(Math.random()*p+1)  
switch(q) 
{ 
case 1:
document.writeln("<a href=http:\/\/www.jiaoshizhaopinwang.com\/show\/fabu.htm  target=_blank><img src=\/img\/mingde2.gif width=468 height=60><\/a>");
break; 
case 2:
document.writeln("<a href=http:\/\/www.jiaoshizhaopinwang.com\/show\/fabu.htm  target=_blank><img src=\/img\/mingde3.gif width=468 height=60><\/a>");
break; 
}