function desabilita(e) {
	//list all CTRL + key combinations you want to disable
	var forbiddenKeys = new Array('a', 'n', 'c', 'x', 'v', 'j');
	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()) {
				return false;
			}
		}
	}
	return true;
}

//Bloquear o botão direito
if (window.Event)
document.captureEvents(Event.MOUSEUP);

function nocontextmenu()
{
event.cancelBubble = true
event.returnValue = false;

return false;
}

function norightclick(e)
{
if (window.Event)
{
if (e.which == 2 || e.which == 3)
return false;
}
else
if (event.button == 2 || event.button == 3)
{
event.cancelBubble = true
event.returnValue = false;
return false;
}

}
if (document.layers) {
document.captureEvents(Event.MOUSEDOWN);
}
document.oncontextmenu = nocontextmenu;
document.onmousedown = norightclick;
document.onmouseup = norightclick;
//Bloqueou o botão direito