Array的push方法在IE5.0上不正常的解决办法！

来自Mezzi的提示:
//[extended method] push  insert new item
if(typeof(Array.prototype.push)!="function")
{
  Array.prototype.push = function()
  {
    for (var i=0; i<arguments.length; i++)
      this[this.length] = arguments[i];
    return this.length;
  };
}