New Threads since last visit

[Snatch]

I ned a search link to search for new threads since last visit

search.php?do=getnew posts me all posts since last visit but how I can search for all threads ?

If I change in the search.php this

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with thits

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search.php?do=getnew posts me al new threads. This is what I want. But now i doesn´t posts me the new posts. What should I so to make both posible.

Sorry for my bad english

GreeTz an ThX
Snatch