Special back button

display only if referer is a page in my site

[kapow]

I want to add a back button to pages in my site like this:
<input type=button value="Back" onClick="history.go(-1)">

However I don't want the back button to send people away from the site e.g. if they arrived at that page from another site or search engine. Is there javascript to display a back button only if the visitor came from a page within my site? e.g.:

if (referrer = this domain) {back button code}

[dmorison]

This should work:

<script type='text/javascript'>
if (document.referrer.indexOf('yourdomain.com')!= -1)
{
document.write('<input type=button value="Back" onClick="history.go(-1)">');
}
</script>

[kapow]

THANK YOU :)
That works perfectly.