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;
 }       
 }
 document.oncontextmenu = nocontextmenu;         
 document.onmousedown = norightclick;