function KeyPressed(e){
  var characterCode;
	if(e && e.which){ //if which property of event object is supported (NN4)
		characterCode = e.which; //character code is contained in NN4's which property
	}else{
		e = event;
		characterCode = e.keyCode; //character code is contained in IE's keyCode property
	}
	return characterCode;
}