Código:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Documento sin título</title> </head> <body> <form action="appletr.php" target="ChatVentana" name="chat" onsubmit="window.open('', 'ChatVentana', 'scrollbars=no,resizable=no,width=750,height=450,top=40,left=20')" method="post" id="chat"> <label> <input type="text" name="email" id="email" /> </label> <p> <label> <input type="submit" name="submit" id="submit" value="Enviar" /> </label> </p> </form> </body> </html>