双面枪爷:关于图片响应鼠标的一个问题

我想在一个网页上实现两处“图片响应鼠标”的功能，但当我输入两遍代码尝试时，没有成功，索性两处的图片经鼠标点击都不动，想问一下代码中需修改哪几个内容呢？谢谢！以下是我所尝试的代码：
<SCRIPT language=JavaScript>
<!-- Begin
var rand1 = 0;
var useRand = 0;
images = new Array;
images[1] = new Image();
images[1].src = "images/bb001.gif";
images[2] = new Image();
images[2].src = "images/bb002.gif";
function swapPic() {
var imgnum = images.length - 1;
do {
var randnum = Math.random();
rand1 = Math.round((imgnum - 1) * randnum) + 1;
} while (rand1 == useRand);
useRand = rand1;
document.randimg.src = images[useRand].src;
}
// End -->
</SCRIPT>
<A onclick=swapPic();><IMG src="images/bb001.gif" border=0 name=randimg></A><BR><SCRIPT language=JavaScript>
<!-- Begin
var rand1 = 0;
var useRand = 0;
images = new Array;
images[1] = new Image();
images[1].src = "images/bb003.gif";
images[2] = new Image();
images[2].src = "images/bb004.gif";
function swapPic() {
var imgnum = images.length - 1;
do {
var randnum = Math.random();
rand1 = Math.round((imgnum - 1) * randnum) + 1;
} while (rand1 == useRand);
useRand = rand1;
document.randimg.src = images[useRand].src;
}
// End -->
</SCRIPT>
<A onclick=swapPic();><IMG src="images/bb003.gif" border=0 name=randimg></A><BR>