about = new Image();
about.src = '/images/nav_about_off.jpg';
about_over = new Image();
about_over.src = '/images/nav_about_on.jpg';

experience = new Image();
experience.src = '/images/nav_experience_off.jpg';
experience_over = new Image();
experience_over.src = '/images/nav_experience_on.jpg';

portfolio = new Image();
portfolio.src = '/images/nav_portfolio_off.jpg';
portfolio_over = new Image();
portfolio_over.src = '/images/nav_portfolio_on.jpg';

contact = new Image();
contact.src = '/images/nav_contact_off.jpg';
contact_over = new Image();
contact_over.src = '/images/nav_contact_on.jpg';

function navRoll(navName,navState) {
	if (document.images) {
		document.images[navName].src = eval(navState + ".src");
	}
}