// +----------------------------------------------------------------+
// | Array functions that are missing in MSIE 5.0                   |
// | Author: Cezary Tomczak [www.gosu.pl]                           |
// | Free for any use as long as all copyright messages are intact. |
// +----------------------------------------------------------------+

/* Removes the last element from an array and returns that element.  */
if(!Array.prototype.pop){
    Array.prototype.pop = function(){
        var last;
        if(this.length){
            last = this[this.length - 1];
            this.length -= 1;
        }
        return last;
    };
}

// Adds one or more elements to the end of an array and returns the new length of the array.
if(!Array.prototype.push){
    Array.prototype.push = function(){
        for (var i = 0; i < arguments.length; ++i){ this[this.length] = arguments[i]; }
        return this.length;
    };
}

// Removes the first element from an array and returns that element.
if(!Array.prototype.shift){
    Array.prototype.shift = function(){
        var first;
        if(this.length){
            first = this[0];
            for(var i = 0; i < this.length - 1; ++i){ this[i] = this[i + 1]; }
            this.length -= 1;
        }
        return first;
    };
}

// Adds one or more elements to the front of an array and returns the new length of the array.
if(!Array.prototype.unshift){
    Array.prototype.unshift = function(){
        if(arguments.length){
            var i, len = arguments.length;
            for(i=this.length+len-1; i>=len; --i){ this[i] = this[i - len]; }
            for (i=0; i<len; ++i){ this[i] = arguments[i]; }
        }
        return this.length;
    };
}

// Adds and/or removes elements from an array.
if(!Array.prototype.splice){
    Array.prototype.splice = function(index, howMany){
        var elements = [], removed = [], i;
        for(i=2; i<arguments.length; ++i){ elements.push(arguments[i]); }
        for(i=index; (i<index+howMany) && (i<this.length); ++i){ removed.push(this[i]); }
        for(i=index+howMany; i<this.length; ++i){ this[i - howMany] = this[i]; }
        this.length -= removed.length;
        for(i=this.length+elements.length-1; i>=index+elements.length; --i){ this[i] = this[i - elements.length]; }
        for(i=0; i<elements.length; ++i){ this[index + i] = elements[i]; }
        return removed;
    };
}