function ns(evt) { if (evt.which == 3) return false; } 
function iemouse() { if (event.shiftKey) {  
event.cancelBubble = true; 
event.returnValue = false; 
return false; } 
return true; } 
function ie() { return false; } 
function onKeyDown() { if ( (event.altKey) || ((event.keyCode == 8) &&  
(event.srcElement.type != "text" && 
event.srcElement.type != "textarea" && 
event.srcElement.type != RPROP_SESSION_PASSWORD)) ||  
((event.ctrlKey) && ((event.keyCode == 78) || (event.keyCode == 82)) ) || 
(event.keyCode == 116) )  
{ event.keyCode = 0; 
event.returnValue = false; } } 
if (navigator.appName.indexOf("Netscape") != -1) { 
document.captureEvents(Event.MOUSEDOWN); 
document.onmousedown = ns; } 
else 
{ document.oncontextmenu = ie; 
document.onclick= iemouse; 
document.onkeydown = onKeyDown; }