Disable enter key for selected submit buttons within a form

<html>
    <head>
        <script type='text/javascript'>
function keyPressed(e)
{
     var key;
     if(window.event)
          key = window.event.keyCode; //IE
     else
          key = e.which; //firefox

     return (key != 13);
 }
        </script>
    </head>
    <body>
        <form action="1">
            <input type="text" />
        </form>
        <form action="2">
            <input type="text" onKeyPress="return keyPressed(event)"/>
        </form>
    </body>
</html>