referrer
Value: String. Read-Only
Compatibility: WinIE3+, MacIE3+, NN2+, Moz+, Safari+
When a link from one document leads to another, the second document can, under JavaScript control, reveal the URL of the document containing the link. The document.referrer property contains a string of that URL. This feature can be a useful tool for customizing the content of pages based on the previous location the user was visiting within your site. A referrer contains a value only when the user reaches the current page through a link. Any other method of navigation (such as through the history, bookmarks, or by manually entering a URL) sets this property to an empty string.
The document.referrer property usually returns an empty string unless the files are retrieved from a web server.
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