Для чего нужен яваскрипт JavaScript1.2 в шаблоне main.tpl?

<script language="javascript1.2">
<!--
    var ns6=document.getElementById&&!document.all?1:0
    var head="display:''"
    var folder=''
    function expandit(curobj){
        folder=ns6?curobj.nextSibling.nextSibling.style:document.all[curobj.sourceIndex+1].style
        if (folder.display=="none")
            folder.display=""
        else
            folder.display="none"
    }
    //-->
</script>