aqui os dejo el codigo
Código HTML:
<html> <body onKeyDown="estaPulsadoControl(event);" id="miBody" value="3"> <script type="text/javascript"> function estaPulsadoControl(event){ if (event.ctrlKey==1){ document.getElementById("miBody").onkeydown = ""; alert('esta pulsado'); } } </script> </body> </html>