if (document.images) {

	homeon = new Image();
	homeon.src = "images/btn_home_on.jpg";

	abouton = new Image();
	abouton.src = "images/btn_about_on.jpg";

	contacton = new Image();
	contacton.src = "images/btn_contact_on.jpg";


	homeoff = new Image();
	homeoff.src = "images/btn_home_off.jpg";

	aboutoff = new Image();
	aboutoff.src = "images/btn_about_off.jpg";

	contactoff = new Image();
	contactoff.src = "images/btn_contact_off.jpg";

}


function imgOn(imgDocID,imgObjName)
{
	document.images[imgDocID].src = eval(imgObjName + ".src");
}