document.oncontextmenu = function(){return false}
if(document.layers) {
        window.captureEvents(Event.MOUSEDOWN);
        window.onmousedown = function(e){
                if(e.target==document)return false;
        }
}
else { document.onmousedown = function(){return false} }

function processKey() 
{ 
        if( (event.ctrlKey == true && (event.keyCode == 78 || event.keyCode == 82)) || 
        (event.keyCode >= 112 && event.keyCode <= 123)) 
            { 
        event.keyCode = 0; 
        event.cancelBubble = true; 
        event.returnValue = false; 
            } 
} 
document.onkeydown = processKey;