var m=1;
var n=Math.floor(Math.random()*m+1);
switch(n)
{
case 1:
document.writeln("<a href=\"http:\/\/www.senlm.cn\/article-230-SenLM.html\"><img src=\"\/1zzs\/senlm-pifa2010.gif\" \/><\/a>");
document.writeln("");
break;
}