// JavaScript Document
if ( document.all ) { 
	document.oncontextmenu = click_right;
	document.onkeypress = disableCtrlKeyCombination;
	document.onkeydown = disableCtrlKeyCombination;
}
else
{
	document.body.setAttribute("onkeypress","return disableCtrlKeyCombination(event);");
	document.body.setAttribute("oncontextmenu","alert('Rechtermuisklik is uitgeschakeld.');return false;");
}
if ( document.layers ) { 
	document.captureEvents(Event.MOUSEDOWN); 
	document.onmousedown = click_right; 
	document.onkeypress = disableCtrlKeyCombination;
	document.onkeydown = disableCtrlKeyCombination;
} 
function click_right(evenement) { 
	if ( document.all ) { 
		alert('Rechtermuisklik is uitgeschakeld.'); 
		return false; 
	} 
	else if ( document.layers ) { 
		if ( evenement.which == 3 ) { 
			alert('Rechtermuisklik is uitgeschakeld.'); 
			return false; 
		}
		if ( evenement.modifiers == 2 ) { 
			alert('Rechtermuisklik is uitgeschakeld.'); 
			return false; 
			} 
		} 
	return true; 
} 
function disableCtrlKeyCombination(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())
                        {
                                alert('Toetscombinatie CTRL + '
                                        +String.fromCharCode(key)
                                        +' is uitgeschakeld.');
                                return false;
                        }
                }
        }
        return true;
}