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<html> <head> <title>Clima</title> </head> <script language="JavaScript1.2"> function cargar(){ formulario.submit() } </script> <body> <form id="formulario" name="formulario" method="post" action="prueba1.php" target="frtiempo"> <select name="id" onchange="javascript:cargar()"> <option value="0">Seleccione un lugar </option> <option value="92">Mendoza </option> <option value="52">Alto Del Carmen </option> <option value="35">El Hospicio </option> <option value="108">Alhué </option> <option value="24" <?php if ($_post["id"]==null){ ?>selected="selected"<?php }?>>Buenos Aires</option> <option value="206">Cusco </option> <option value="1">Palena </option> </select> </span> </form> <iframe <?php if ($_POST["id"]==null){ ?>src="santiago.html"<?php } else {?>src="prueba1.php"<?php }?> name="frtiempo" width="750" height="750" marginheight="0" frameborder="0" ></iframe> </body> </html>