I have three different pop up ads javascript code uploaded on my site. I want to make a Javascript program that will randomly change one each time a page is loaded. How would I do this?

**Script 1**

```
<script type="text/javascript">
    var uid = '12946';
    var wid = '23707';
</script>
<script type="text/javascript" src="http://cdn.pop.net/pop.js"></script>

```

**Script 2**

```
<script type="text/javascript">
    var uid = '22333';
    var wid = '234333';
</script>
<script type="text/javascript" src="http://cdn.pop.net/pop.js"></script>

```

**Script 3**

```
<script type="text/javascript">
    var uid = '14444';
    var wid = '23444';
</script>
<script type="text/javascript" src="http://cdn.pop.net/pop.js"></script>

```