Preparation code

<script type="text/javascript">
//<![CDATA[
function Array_indexOf(t) {
        for(var i = 0, l = this.length; i < l; ++i)
                if (this[i] === t) return i;
        return -1;
}
Object.defineProperties( Array.prototype,
        { indexOf2 : { value : Array_indexOf } } );
//]]>
</script>

Test runner

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Java applet disabled.

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14].indexOf(8);
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14].indexOf(14);
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14].indexOf(-1);

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14].indexOf2(8);
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14].indexOf2(14);
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14].indexOf2(-1);

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