function onKeyDown(e) {
	var valid =true;
  // current pressed key		
	if(window.event){
		//alert("ie");
	  	var pressedKey = String.fromCharCode(e.keyCode).toLowerCase();
		if (e.ctrlKey && (pressedKey == "c" || pressedKey == "v")) {
		// disable key press porcessing
			valid = false;
		}
	}else{
		 var pressedKey = String.fromCharCode(e.which).toLowerCase();
		 if (e.ctrlKey && (pressedKey == "c" || pressedKey == "v")) {
			// disable key press porcessing
		//	alert(e.ctrlKey + " ctrlkey");
			valid = false;
		}
	}
	return valid;
}