function iconHelp() 
{
	var v = document.getElementById('ajuda').style.visibility;
	if(v == 'visible'){
		document.getElementById('ajuda').style.visibility = 'hidden';
		//document.images.imgHelp.src = 'image/btnHelp.png';
		document.getElementById('imgHelp').src = 'image/btnHelp.png';
	} else {
		document.getElementById('ajuda').style.visibility = 'visible';
		//document.images.imgHelp.src = 'image/btnExit.png';
		document.getElementById('imgHelp').src = 'image/btnExit.png';
	}
}