Javascript ActiveElement and Keydown Event Listener
===

I'm new to Javascript and I'm trying to make the following code scan to see if a textbox with an id="lessonNum" is active, if it is not i would like to send a .click to a submit button with an id="A" when I press 'a' on the keyboard. Right now when I select the textbox I get an alert, but when I don't have it selected it doesn't pick up my keydown. Please Help!
    
    function GetActive () {
			if (document.activeElement.id == 'lessonNum') {
				alert('lessonNum is active');
				var b1=new Boolean(1);
			} else {
				var b1=new Boolean(0);
				}
        }
		document.addEventListener("keydown", keyDownTextField, false);
		function keyDownTextField(e) {
		var keyCode = e.keyCode;
		if(keyCode==65) {
		if(b1==0) {
		alert('a has been pressed');
		document.getElementById('A').click();
		} 
		}
		}