/*
	Array.indexOf for IE6&7
	Source: https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf#Compatibility
*/

if (!Array.prototype.indexOf) {  
    Array.prototype.indexOf = function (searchElement /*, fromIndex */ ) {  
        "use strict";  
        if (this === void 0 || this === null) {  
            throw new TypeError();  
        }  
        var t = Object(this);  
        var len = t.length >>> 0;  
        if (len === 0) {  
            return -1;  
        }  
        var n = 0;  
        if (arguments.length > 0) {  
            n = Number(arguments[1]);  
            if (n !== n) { // shortcut for verifying if it's NaN  
                n = 0;  
            } else if (n !== 0 && n !== (1 / 0) && n !== -(1 / 0)) {  
                n = (n > 0 || -1) * Math.floor(Math.abs(n));  
            }  
        }  
        if (n >= len) {  
            return -1;  
        }  
        var k = n >= 0 ? n : Math.max(len - Math.abs(n), 0);  
        for (; k < len; k++) {  
            if (k in t && t[k] === searchElement) {  
                return k;  
            }  
        }  
        return -1;  
    }  
}