function fadeOut(which)
{
	var what;
	for (i=1; i<=10; i++)
	{
		what = 100 - (i * 10);
		setTimeout('changeOpac(\"'+which+'\",'+what+')',i*50);
	}
}

function fadeIn(which)
{
	var what;
	for (i=1; i<=10; i++)
	{
		what = i * 10;
		setTimeout('changeOpac(\"'+which+'\",'+what+')',i*50);
	}
}

function changeOpac(which,what)
{
	document.getElementById(which).className = 'opacity' + what;
}