/**
 * @class Array
 */
Ext.applyIf(Array.prototype, {
    
/**
     * Checks whether or not the specified object exists in the array.
     * @param {Object} o The object to check for
     * @param {Number} from (Optional) The index at which to begin the search
     * @return {Number} The index of o in the array (or -1 if it is not found)
     */
    indexOf: function(o, from) {
        var len = this.length;
        from = from || 0;
        from += (from < 0) ? len: 0;
        for (; from < len; ++from) {
            if (this[from] === o) {
                return from;
            }
        }
        return - 1;
    },

    
/**
     * Removes the specified object from the array.  If the object is not found nothing happens.
     * @param {Object} o The object to remove
     * @return {Array} this array
     */
    remove: function(o) {
        var index = this.indexOf(o);
        if (index != -1) {
            this.splice(index, 1);
        }
        return this;
    },

    contains: function(o) {
        return this.indexOf(o) !== -1;
    }
});