Programacion y Desarrollo Web

<script language="JavaScript"> 
var message = ""; 
function clickIE(){ 
if (document.all){ 
(message); 
return false; 
} } 
function clickNS(e){ 
if (document.layers || (document.getElementById && !document.all)){ 
if (e.which == 2 || e.which == 3){ 
(message); 
return false; 
} 
} 
} 
if (document.layers){ 
document.captureEvents(Event.MOUSEDOWN); 
document.onmousedown = clickNS; 
} else { 
document.onmouseup = clickNS; 
document.oncontextmenu = clickIE; 
} 
document.oncontextmenu = new Function("return false") 
</script>

document.onkeypress = KeyPressed;
function KeyPressed(e)
{ return ((window.event) ? event.keyCode : e.keyCode) != 13; }

onkeypress="return event.keyCode!=13

< input type="text" name="nombre" onkeypress="return event.keyCode!=13">

< form method="post" action="ejecutar.php" onkeypress="return event.keyCode!=13">