Question : settings according to referrer

hello there,
I have a page thats shows an image depending on two specific referrer.. so lets say the surfer came from yahoo show logo2
and if it came from google show logo3.. after they fill a little form and click submit the logo changes back to normal logo1
because it loses web referrer from yahoo or google.. what can I do about this little issue?

Answer : settings according to referrer

Okay so lets say that when the user comes in to your page you have a form setup something like below. See my before and after comments.

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//BEFORE
<form>
<input type="text" name="name">
<input type="text" name="address">
</form>

//AFTER
<form>
<input type="hidden" name="referrer" value="<?php echo $_SERVER["HTTP_REFERRER"]; ?>">
<input type="text" name="name">
<input type="text" name="address">
</form>