// JavaScript Document
function disableRightClick(){oncontextmenu="window.event.returnValue=false";}
function noCopy(){oncopy="return false;" 
				  oncut="return false;"}
function lockShift(){ 
if(event.shiftKey) 
alert("禁止按Shift键!"); //可以换成ALT　CTRL
} 
document.onkeydown=lockShift; 

function lockCTRL(){ 
if(event.ctrlKey) 
alert("禁止按control键!"); //可以换成ALT　CTRL
} 
document.onkeydown=lockCTRL; 

function lockALT(){ 
if(event.altKey) 
alert("禁止按ALT键!"); //可以换成ALT　CTRL
} 
document.onkeydown=lockALT;