if (document.images)
    {
    	b01on = new Image(); b01on.src = "images/ohome.png";
    	b02on = new Image(); b02on.src = "images/onaval.png";
    	b03on = new Image(); b03on.src = "images/oheavy.png";
   	b04on = new Image(); b04on.src = "images/omarine.png";
    	b05on = new Image(); b05on.src = "images/ostructure.png";
	b06on = new Image(); b06on.src = "images/obespoke.png";
	b07on = new Image(); b07on.src = "images/omotion.png";
	b08on = new Image(); b08on.src = "images/ocad.png";
	b09on = new Image(); b09on.src = "images/onews.png";
	b10on = new Image(); b10on.src = "images/ocontact.png";
	b11on = new Image(); b11on.src = "images/oclient.png";

	b12on = new Image(); b12on.src = "images/omarineeng.png";

	b13on = new Image(); b13on.src = "images/oenvironmental.png";

    	b01off = new Image(); b01off.src = "images/nhome.png";
    	b02off = new Image(); b02off.src = "images/nnaval.png";
	b03off = new Image(); b03off.src = "images/nheavy.png";
	b04off = new Image(); b04off.src = "images/nmarine.png";
	b05off = new Image(); b05off.src = "images/nstructure.png";
	b06off = new Image(); b06off.src = "images/nbespoke.png";
	b07off = new Image(); b07off.src = "images/nmotion.png";
	b08off = new Image(); b08off.src = "images/ncad.png";
	b09off = new Image(); b09off.src = "images/nnews.png";
	b10off = new Image(); b10off.src = "images/ncontact.png";
	b11off = new Image(); b11off.src = "images/nclient.png";
	b12off = new Image(); b12off.src = "images/nmarineeng.png";
	b13off = new Image(); b13off.src = "images/nenvironmental.png";
    }

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");
        }
	}