<form method="post" action="kelime.php">
	<input type="text" name="kelime" /> <input type="submit" value="ara" />
</form>

<?php
	@$kelime = $_POST['kelime'];
	if(isset($kelime)) {
		if(!empty($kelime)) {
			header("location:http://$kelime.blogez.org/");
		}
	}
?>