if (document.images)   {
    b01on = new Image(); b01on.src = "images/ohome.gif";
	b02on = new Image(); b02on.src = "images/oabout.gif";
	b03on = new Image(); b03on.src = "images/ovirtual.gif";
	b04on = new Image(); b04on.src = "images/osell.gif";
	b05on = new Image(); b05on.src = "images/onews.gif";
	b06on = new Image(); b06on.src = "images/oenq.gif";
	b07on = new Image(); b07on.src = "images/oother.gif";
	b08on = new Image(); b08on.src = "images/ocontact.gif";

    b01off = new Image(); b01off.src = "images/nhome.gif";
	b02off = new Image(); b02off.src = "images/nabout.gif";
	b03off = new Image(); b03off.src = "images/nvirtual.gif";
	b04off = new Image(); b04off.src = "images/nsell.gif";
	b05off = new Image(); b05off.src = "images/nnews.gif";
	b06off = new Image(); b06off.src = "images/nenq.gif";
	b07off = new Image(); b07off.src = "images/nother.gif";
	b08off = new Image(); b08off.src = "images/ncontact.gif";
    }

function imgOn(imgName)
	{
    if (document.images)
    	{
        document[imgName].src = eval(imgName + "on.src");
        }
	}

function imgOff(imgName)
	{
    if (document.images)
    	{
        document[imgName].src = eval(imgName + "off.src");
        }
	}