var m=1;
var n=Math.floor(Math.random()*m+1);
switch(n)
{
case 1:
document.writeln("<a href=\"http:\/\/www.heixiaotu.net\" target=\"_blank\" onclick=\"'242';\"><img src=\"http:\/\/www.heixiaotu.net\/upfile\/201113013521646449.jpg\"  border=\"0\"  width=\"200\" height=\"70\" alt=\"黑小兔商城\"><\/a>");
break;
}