if (document.images) {

	header = new Image
	header.src = 'images/header.gif'

	concept_off = new Image
	concept_on = new Image
	concept_off.src = 'images/menu_concept_off.gif'
	concept_on.src = 'images/menu_concept_on.gif'

	bio_off = new Image
	bio_on = new Image
	bio_off.src = 'images/menu_bio_off.gif'
	bio_on.src = 'images/menu_bio_on.gif'

	contact_off = new Image
	contact_on = new Image
	contact_off.src = 'images/menu_contact_off.gif'
	contact_on.src = 'images/menu_contact_on.gif'
}