if (document.images) {
		buttonhomeon = new Image
		buttonhome = new Image
		buttonerpinfoon = new Image
		buttonerpinfo = new Image
		buttongisrslabon = new Image
		buttongisrslab = new Image
		buttonfacultyon = new Image
		buttonfaculty = new Image
		buttonstudentson = new Image
		buttonstudents = new Image
		buttonadmissionon = new Image
		buttonadmission = new Image
		buttoncontacton = new Image
		buttoncontact = new Image
		
		buttonhomeon.src = "images/nav/home_on.jpg"
		buttonhome.src = "images/nav/home.jpg"
		buttonerpinfoon.src = "images/nav/erp-info_on.jpg"
		buttonerpinfo.src = "images/nav/erp-info.jpg"
		buttongisrslabon.src = "images/nav/gis-rs-lab_on.jpg"
		buttongisrslab.src = "images/nav/gis-rs-lab.jpg"
		buttonfacultyon.src = "images/nav/faculty_on.jpg"
		buttonfaculty.src = "images/nav/faculty.jpg"
		buttonstudentson.src = "images/nav/students_on.jpg"
		buttonstudents.src = "images/nav/students.jpg"
		buttonadmissionon.src = "images/nav/admission_on.jpg"
		buttonadmission.src = "images/nav/admission.jpg"
		buttoncontacton.src = "images/nav/contact_on.jpg"
		buttoncontact.src = "images/nav/contact.jpg"
	}
	else {
		buttonhomeon = ""
		buttonhome = ""
		buttonerpinfoon = ""
		buttonerpinfo = ""
		buttongisrslabon = ""
		buttongisrslab = ""
		buttonfacultyon = ""
		buttonfaculty = ""
		buttonstudentson = ""
		buttonstudents = ""
		buttonadmissionon = ""
		buttonadmission = ""
		buttoncontacton = ""
		buttoncontact = ""	
	
		document.button1 = ""
		document.button2 = ""
		document.button3 = ""
		document.button4 = ""
		document.button5 = ""
		document.button6 = ""
		document.button7 = ""
	}