How do you stop another Website from linking to one of your pages?

Example: Website A places a link to Website B. The Webmaster from Website B doesn't want Website A's link and instead wants to link it to another page. Is there a code that Website B's Webmaster can write on his page to accomplish this?

<SCRIPT LANGUAGE=JAVASCRIPT TYPE="TEXT/JAVASCRIPT">
if ((document.referrer != '') && (document.referrer.indexOf("bad_linking_site.com") != -1)) {
//They're from bad_linking_site, let's send them to hell!
document.location = "http://www.hell.com";
}
</SCRIPT>

Thank you! I just modified it a little but I got it to work! See below:

<SCRIPT LANGUAGE=JAVASCRIPT TYPE="TEXT/JAVASCRIPT">
if ((document.referrer != '') && ((document.referrer.indexOf(http://www.bad-url.com) != -1) || (document.referrer.indexOf("http://www.bad-url.com") != -1))) {
//
document.location = "http://www.bad-url.com";
}
</SCRIPT>

Haha, that is awesome. One of my pet projects gets random porn sites linking to them (so that me and anyone else reading the stats will go visit them). Those sites are going straight to hell.... lol