Add ECMA262-5 indexOf method if not supported natively Taken from http://stackoverflow.com/questions/2790001/fixing-javascript-array-functions-in-internet-explorer-indexof-foreach-etc

indexOf.js

if (!('indexOf' in Array.prototype)) {
    Array.prototype.indexOf= function(find, i) {
        if (i===undefined) i= 0;
        if (i<0) i+= this.length;
        if (i<0) i= 0;
        for (var n= this.length; i<n; i++)
            if (i in this && this[i]===find)
                return i;
        return -1;
    };
}