var __preloadImgs = new Array (
);
function preloadImg () {}
function changeImg () {}



var _imgPreloaded = false;



function preloadImg () {

	if (document.images) {

		changeImg ();

		var tmpImgs = new Array ();

		for (var i = 0; i < __preloadImgs.length; i++) {

			tmpImgs [i] = new Image ();

			tmpImgs [i].src = __preloadImgs [i];

		}

		_imgPreloaded = true;

	}

}



var _bakImgs = new Array ();

var _bakImgLen = 0;



function changeImg () {

	var args = arguments;

	if (document.images && _imgPreloaded) {

		if (args.length) {

			for (var i = 0; i < args.length; i += 2) {

				_bakImgs [i] = args [i];

				_bakImgs [i + 1] = document.images [args [i]].src;

				document.images [args [i]].src = args [i + 1];

			}

			_bakImgLen = i;

		} else {

			for (var i = 0; i < _bakImgLen; i += 2) {

				document.images [_bakImgs [i]].src = _bakImgs [i + 1];

			}

		}

	}

}

// 20010310