function navMouseOver(elmt)
{
	var parent = elmt.parentNode;
	parent.style.backgroundPosition = 'top left';
}

function navMouseOut(elmt)
{
	var parent = elmt.parentNode;
	parent.style.backgroundPosition = 'bottom left';
}

function btnMouseOver(elmt)
{
	var parent = elmt.parentNode;
	var grandparent = parent.parentNode;
	parent.style.backgroundPosition = 'top right';
	grandparent.style.backgroundPosition = 'top left';
}

function btnMouseOut(elmt)
{
    var parent = elmt.parentNode;
	var grandparent = parent.parentNode;
	parent.style.backgroundPosition = 'bottom right';
	grandparent.style.backgroundPosition = 'bottom left';
}