Untitled

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Disable Ctrl Key Combinations </title>
<script language="JavaScript">

function disableCtrlKeyCombination(e)
{
//list all CTRL + key combinations you want to disable
var forbiddenKeys = new Array('a', 'n', 'c', 'x', 'v', 'j' , 'w');
var key;
var isCtrl;
if(window.event)
{
key = window.event.keyCode;     //IE
if(window.event.ctrlKey)
isCtrl = true;
else
isCtrl = false;
}
else
{
key = e.which;     //firefox
if(e.ctrlKey)
isCtrl = true;
else
isCtrl = false;
}
//if ctrl is pressed check if other key is in forbidenKeys array
if(isCtrl)
{
for(i=0; i<forbiddenKeys.length; i++)
{
//case-insensitive comparation
if(forbiddenKeys[i].toLowerCase() == String.fromCharCode(key).toLowerCase())
{
alert('Key combination CTRL + '+String.fromCharCode(key) +' has been disabled.');
return false;
}
}
}
return true;
}
</script>
</head>
<body onkeypress="return disableCtrlKeyCombination(event);" onkeydown="return disableCtrlKeyCombination(event);">
Press ctrl and you can check various key is disable with CTRL. like  — 'a', 'n', 'c', 'x', 'v', 'j' , 'w' Just add key in above the array and disable key as you want.
</body>
</html>