function clickIE4(){
         if (event.button==2){
                 return false;
         }
 }
  
 function clickNS4(e){
         if (document.layers||document.getElementById&&!document.all){
                 if (e.which==2||e.which==3){
                         return false;
                 }
         }
 }
  
 function OnDeny(){
         if(event.ctrlKey || event.keyCode==78 && event.ctrlKey || event.altKey || event.altKey && event.keyCode==115){
                 return false;
         }
 }
  
 if (document.layers){
         document.captureEvents(Event.MOUSEDOWN);
         document.onmousedown=clickNS4;
         document.onkeydown=OnDeny();
 }else if (document.all&&!document.getElementById){
         document.onmousedown=clickIE4;
         document.onkeydown=OnDeny();
 }

 document.oncontextmenu=new Function("return false");

 function key() {
    if(event.ctrlKey){
    return false;
    }
}
document.onkeydown=key;