Tai reikia funkcijai perduoti iframe pavadinima "targ" parametre. Tiek 
turetu pakakti.
PVZ:

<iframe name="myframe"></iframe>
<select id='myselect'>
	<option value="http://www.google.lt">1</option>
	<option value="http://www.bing.com">2</option>
</select>
<input type="button" onclick="go_there('myframe', 
getElementById('myselect'))">
 


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