function swapImage(id, state)
{
	var img = document.getElementById(id);
	var oldState = undefined;
	if(state=='out')
	{
		oldState = 'over';
	}
	else
	{
		oldState = 'out';
	}
	var lastIndex = img.src.lastIndexOf(oldState);
	if(lastIndex!=-1)
	{
		var src = img.src.substring(0,lastIndex) + state + '.png';
		img.src = src;
	}
}