window.history.forward(1);

 function showDown(evt) {
 
       evt = (evt) ? evt : ((event) ? event : null);
 
       if (evt) {
           if (event.keyCode == 8 && (event.srcElement.type != "text" && event.srcElement.type != "textarea" && event.srcElement.type != "password")) {
               // When backspace is pressed but not in form element
               cancelKey(evt);
           }
           else if (event.keyCode == 116) {
               // When F5 is pressed
               cancelKey(evt);
           }
           else if (event.keyCode == 117) {
               // When F6 is pressed
               cancelKey(evt);
           }
           else if (event.keyCode == 122) {
               // When F11 is pressed
               cancelKey(evt);
           }
           else if (event.ctrlKey && (event.keyCode == 78 || event.keyCode == 82)) {
               // When ctrl is pressed with R or N
               cancelKey(evt);
           }
       }
   }

   function cancelKey(evt) {
       if (evt.preventDefault) {
           evt.preventDefault();
           return false;
       }
       else {
           evt.keyCode = 0;
           evt.returnValue = false;
       }
   }

   // Additional code for NS
   if (navigator.appName=="Netscape") {
       document.addEventListener("keypress",showDown,true);
   }
   document.onkeydown  = showDown;

  
  
document.oncontextmenu = function(){return false}