index.php

<form class="form" action="<?=$_SERVER['PHP_SELF']?>" method="post" enctype="text/plain"> 
    <label for="name" accesskey="n" tabindex="1">Nombre</label> 
    <input type="text" id="name" name="name" value="" /> 
    <label for="email" accesskey="e" tabindex="2">E-Mail</label> 
    <input type="text" id="email" name="email" value=""/>  
    <label for="website" accesskey="w" tabindex="3">Sitio Web</label> 
    <input type="text" id="website" name="website" value=""/> 
    <label for="mensaje" accesskey="m" tabindex="4">Mensaje</label> 
    <textarea name="mensaje" id="mensaje" rows="10" cols="10"></textarea> 
    <div style="clear:both"></div>  
    <button type="submit" class="btn">Enviar</button> 
</form>