I know that some browsers doesn't gives support to $HTTP_REFERER variable ( 
lynx in example). I am thinking on checking the browser ident (with 
HTTP_USER_AGENT) and managing $HTTP_REFERER as a session var in those cases 
who doesn't give support. But it would be great that if somebody found 
another solution shares it with me.

Thanks in advance , and compaints about my English,

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