var total = 2;

var refs = [
"http://nork.ru",
"http://www.doctrine.ru"
];


var rn = Math.random();
var ch = Math.floor(rn * total);
var ln = refs[ch];
document.write("\n<a href=\"" + ln + "\"><img src=\"http://anarh.ru/anarch/java/anarh1/a" + (ch+1) + ".gif\" width=468 height=60 alt=\"\" border=\"0\"></a>\n");