<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script>   
<script>$(document).ready(function(){   
var jun=0;   
$(document).keydown(function(e){   
if(e.keyCode==17 ){   
jun++;   
if(jun==2){   
return false;jun=0;   
}}   
if(e.keyCode==67 ){   
jun++;   
if(jun==2){   
return false;jun=0;   
}}}).keyup(function(e){   
if(jun>0){   
jun=jun-1;   
}});   
});   
document.oncontextmenu=new Function("return false");   
</script>