var abouton= new Image()
abouton.src = "images/nav_about_on.gif"
var aboutoff= new Image()
aboutoff.src = "images/nav_about_off.gif"

var featureon= new Image()
featureon.src = "images/nav_feature_on.gif"
var featureoff= new Image()
featureoff.src = "images/nav_feature_off.gif"

var charitieson= new Image()
charitieson.src = "images/nav_charities_on.gif"
var charitiesoff= new Image()
charitiesoff.src = "images/nav_charities_off.gif"

var employeeson= new Image()
employeeson.src = "images/nav_employees_on.gif"
var employeesoff= new Image()
employeesoff.src = "images/nav_employees_off.gif"

var contacton= new Image()
contacton.src = "images/nav_contact_on.gif"
var contactoff= new Image()
contactoff.src = "images/nav_contact_off.gif"

function showImage(fname) {
iname=eval(fname + "on.src");
document[fname].src = iname;}

function hideImage(fname) {
iname=eval(fname + "off.src");
document[fname].src = iname;}