var total = 6;

var refs = [
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"http://evrazia.org/modules.php?name=News&file=article&sid=2602",
"http://evrazia.org/modules.php?name=News&file=article&sid=2602",
"http://www.evrazia.org/",
"http://arctogaia.org.ru/FORUMS/",
"http://www.evrazia.org/"

];


var rn = Math.random();
var ch = Math.floor(rn * total);
var ln = refs[ch];
document.write("\n<a href=\"" + ln + "\"><img src=\"http://arctogaia.com/java/eurasia1/a" + (ch+1) + ".gif\"  alt=\"\" border=\"0\"></a>\n");