if (document.images) {
		buttonhomeon = new Image
		buttonhome = new Image
		buttonundergraduateon = new Image
		buttonundergraduate = new Image
		buttongraduateon = new Image
		buttongraduate = new Image
		buttonfacultyandstaffon = new Image
		buttonfacultyandstaff = new Image
		buttongeographyon = new Image
		buttongeography = new Image
		buttoncontacton = new Image
		buttoncontact = new Image
		
		buttonhomeon.src = "images/nav/home-on.jpg"
		buttonhome.src = "images/nav/home.jpg"
		buttonundergraduateon.src = "images/nav/undergraduate-on.jpg"
		buttonundergraduate.src = "images/nav/undergraduate.jpg"
		buttongraduateon.src = "images/nav/graduate-on.jpg"
		buttongraduate.src = "images/nav/graduate.jpg"
		buttonfacultyandstaffon.src = "images/nav/facultyandstaff-on.jpg"
		buttonfacultyandstaff.src = "images/nav/facultyandstaff.jpg"
		buttongeographyon.src = "images/nav/geography-on.jpg"
		buttongeography.src = "images/nav/geography.jpg"
		buttoncontacton.src = "images/nav/contact-on.jpg"
		buttoncontact.src = "images/nav/contact.jpg"
	}
	else {
		buttonhomeon = ""
		buttonhome = ""
		buttonundergraduateon = ""
		buttonundergraduate = ""
		buttongraduateon = ""
		buttongraduate = ""
		buttonfacultyandstaffon = ""
		buttonfacultyandstaff = ""
		buttongeographyon = ""
		buttongeography = ""
		buttoncontacton = ""
		buttoncontact = ""	
	
		document.button1 = ""
		document.button2 = ""
		document.button3 = ""
		document.button4 = ""
		document.button5 = ""
		document.button6 = ""
	}