javasc, пример из МСДН...
<HEAD>
<SCRIPT>
function checkKey()
{
if (window.event.shiftKey) // checks whether the SHIFT key
// is pressed
{
txtOutput.value = "true"; // returns TRUE if SHIFT is pressed
// when the event fires
}
}
</SCRIPT>
</HEAD>
<BODY>
<P>Press the SHIFT key while pressing another key.<BR>
<INPUT TYPE=text NAME=txtEnterValue onkeypress="checkKey()">
<P>Indicates "true" if the shift key is used.<BR>
<INPUT TYPE=text NAME=txtOutput>
</BODY>