<form action="http://ftp.vonwulfen.de/laga2018/test.html" method="post" enctype="multipart/form-data" target="Hotel" >
<tr><td>
<select name="sucheort" size="1">
<option>Alle Orte</option>
<option>Bad Iburg</option>
<option>Bad Laer</option>
<option>Bad Rothenfelde</option>
<option>Glandorf</option>
<option>Lienen</option>
</select>
</td>
<td>
<input type="submit" value="Suchen">
</td></tr>
</form>

<iframe src="http://baseportal.de/cgi-bin/baseportal.pl?htx=/LGS2018_2/test_iframe" width="850px" height="1600px" name="Hotel">
</iframe>

<perl>
out "Test Variable: $sucheort";
</perl>