if (window.opera)
{
    Array.prototype.concat = function()
    {
        var array = [];
        for (var i = 0, length = this.length; i < length; i++)
        {
            array.push(this[i]);
        }
        for (var i = 0, length = arguments.length; i < length; i++)
        {
            if (arguments[i] instanceof Array)
            {
                for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
                    array.push(arguments[i][j]);
            }
            else
            {
                array.push(arguments[i]);
            }
        }
        return array;
    }
}
Array.prototype.indexOf = function(item)
{
    for (var i = 0, length = this.length; i < length; i++)
    {
        if (this[i] === item)
        {
            return i;
        }
    }
    return -1;
}
Array.prototype.lastIndexOf = function(item)
{
    var n = this.slice(0, this.length).reverse().indexOf(item);
    return (n < 0) ? n : i - n - 1;
}
Array.prototype.remove = function(element)
{
    for (var i = 0, length = this.length; i < length; i++)
    {
        if (this[i] == element)
        {
            this.splice(i, 1);
            i = 0;
        }
    }
}
///去除重复的元素
Array.prototype.removeRepeat = function()
{
    var $array = this;
    var tmp_array = [];
    for (var i = 0, length = $array.length; i < length; i++)
    {
        var value = $array[i];
        if (tmp_array.indexOf(value) == -1)
        {
            tmp_array.push(value)
        }
    }
    for (var j = 0, length = tmp_array.length; j < length; j++)
    {
        this[j] = tmp_array[j];
    }
    this.length = tmp_array.length;
};