Open random page in lightbox (colorbox)

How can I make a link open a random page from a list of pages in a colorbox lightbox based on the following code:

<a class="colorbox" href="page1.html"...

==========UPDATE==========

Thanks Tomm...

I edited your code as follows:

$(document).ready(function() {
    $("a.random").click(function() {
       var randomnumber = Math.floor(Math.random()*8+1);
       if (randomnumber == '1'){
           $(this).attr("href","anypageiwant.html");
       }
       else if....

However, sometimes the same random number/page is chosen more than开发者_如何学运维 once. Is there any way to avoid this?

$(document).ready(function() {
    $("a.colorbox").click(function() {
        $(this).attr("href","print"+Math.floor(Math.random()*11)+".html");
    });
});

Just replace the 11 with whatever number of pages you've got plus 1 (i.e. if you have page1.html to page15.html use Math.random()*16).