<script type="text/javascript">  
document.ondragstart = test;  
document.onselectstart = test;  
document.oncontextmenu = test;  
function test() {  
return false;  
}  
document.oncontextmenu;  
function catchControlKeys(event){  
var code=event.keyCode ? event.keyCode : event.which ? event.which : null;  
if (event.ctrlKey){  
// Ctrl+U  
if (code == 117) return false;  
if (code == 85) return false;  
// Ctrl+C  
if (code == 99) return false;  
if (code == 67) return false;  
// Ctrl+A  
if (code == 97) return false;  
if (code == 65) return false;  
}  
}  
</script>