if (document.images) {

//rollovers
		experience = new Image();
		experience_down = new Image();
		smart_decisions = new Image();
		smart_decisions_down = new Image();
		proven_success = new Image();
		proven_success_down = new Image();
		team = new Image();
		team_down = new Image();
		contact = new Image();
		contact_down = new Image();
		clients = new Image();
		clients_down = new Image();

//rollovers
		experience.src = "_images/nav-experience-home-0.gif";
		experience_down.src = "_images/nav-experience-home-1.gif";
		smart_decisions.src = "_images/nav-smart_decisions-0.gif";
		smart_decisions_down.src = "_images/nav-smart_decisions-1.gif";
		proven_success.src = "_images/nav-success-0.gif";
		proven_success_down.src = "_images/nav-success-1.gif";
		team.src = "_images/nav-team-0.gif";
		team_down.src = "_images/nav-team-1.gif";
		contact.src = "_images/nav-contact-0.gif";
		contact_down.src = "_images/nav-contact-1.gif";
		clients.src = "_images/nav-clients-0.gif";
		clients_down.src = "_images/nav-clients-1.gif";

}

function buttonOn(imageName) {
	if (document.images) {
		document[imageName].src = eval(imageName+"_down.src")
		}
	}

function buttonOff(imageName) {
	if (document.images) {
		document[imageName].src = eval(imageName+".src")
		}
	}