I'm using the Colorbox module in Drupal 7. I'm opening an external website. I can make it work with a link. Click here, then click the "colorbox popup" link at the bottom, middle column. The client would like this to open automatically when the page opens. I've created a block and added the following code (from the colorbox site).

<script type="text/javascript">
// Display a welcome message on first visit, and set a cookie that expires in 30 days:
if (document.cookie.indexOf('visited=true') === -1) {
    var expires = new Date();
    expires.setDate(expires.getDate()+30);
    document.cookie = "visited=true; expires="+expires.toUTCString();
    jQuery.colorbox({html:"http://join.raretearepublic.com/popup/", width:887, height:638});
}
</script>

But it does not work.

Any help would be greatly appreciated.