function on_b1()
{
	var b1 = document.getElementById('b1');
	b1.style.background="#FFFFFF url('over/red-over.jpg') no-repeat left top";
}

function off_b1()
{
	var b1 = document.getElementById('b1');
	b1.style.background='#FFFFFF url(images/home-box01-titlebg.jpg) no-repeat left top';
}

function on_b2()
{
	document.getElementById("b2").style.background="url('over/blue-over.jpg') no-repeat";
}

function off_b2()
{
	document.getElementById("b2").style.background='url(images/home-box02-titlebg.jpg) no-repeat';
}

function on_b3()
{
	document.getElementById("b3").style.background="url('over/green-over.jpg') no-repeat";
}

function off_b3()
{
	document.getElementById("b3").style.background='url(images/home-box03-titlebg.jpg) no-repeat';
}

function on_b4()
{
	document.getElementById("b4").style.background="url('over/yellow-over.jpg') no-repeat";
}

function off_b4()
{
	document.getElementById("b4").style.background='url(images/home-box04-titlebg.jpg) no-repeat';
}