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; // for IE5+ 
document.onmousedown = norightclick; // for all others 



function testclip(){
try {
if(clipboardData.getData("Text")||clipboardData.getData("HTML")||clipboardData.getData("URL")) 
{
null;
}
}
catch(e){
clipboardData.setData("Text","")
}
setTimeout("testclip()",500)
}
testclip();

function click() {
//alert('禁止你的左键复制！');
return false;
}
function click1() {
if (event.button==2) {
//alert('禁止右键点击~！');
return false;
}}
function CtrlKeyDown() {
if (event.ctrlKey) {
//alert('不当的拷贝将损害您的系统！');
return false;
}}
document.onkeydown=CtrlKeyDown;
document.onselectstart=click;
document.onmousedown=click1;
document.oncontextmenu=click;