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If PHP is in your reach, try:
<SCRIPT LANGUAGE="JavaScript" SRC="<?=rand(1,2)?>.js">
If not:
<script>
var oHead = document.getElementsByTagName('HEAD').item(0);
var oScript= document.createElement("script");
oScript.type = "text/javascript";
oScript.src= Math.floor ( Math.random ( ) * 2 + 1 )+".js";
oHead.appendChild( oScript);
</script>
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