function show_hint(hintID, imageID)
{
	document.getElementById(imageID).style.visibility = "visible"
	document.getElementById(hintID).style.visibility = "visible"
}

function hide_hint(hintID, imageID)
{
	document.getElementById(imageID).style.visibility = "hidden"
	document.getElementById(hintID).style.visibility = "hidden"
}