//window.history.forward()

document.onkeydown = function(){
if(window.event && window.event.keyCode == 8) 
  { // Capture and remap F5
	window.event.keyCode = 505;
  	}

if(window.event && window.event.keyCode == 91) 
  { // Capture and remap F5
	window.event.keyCode = 505;
  	}

if(window.event && window.event.keyCode == 18) 
   { // Capture and remap F5
	window.event.keyCode = 505;
  	}

if(window.event && window.event.keyCode == 17) 
   { // Capture and remap F5
	window.event.keyCode = 505;
  	}

if(window.event && window.event.keyCode == 16) 
   { // Capture and remap F5
	window.event.keyCode = 505;
  	}

if(window.event && window.event.keyCode == 116) 
        { // Capture and remap F5
	window.event.keyCode = 505;
  	}

if(window.event && window.event.keyCode == 505) 
  { 
		return false; 
 }
 	
}