var home_off = new Image();
home_off.src = "/speakout/images/global/sitenav-home-off.gif";
var home_on = new Image();
home_on.src = "/speakout/images/global/sitenav-home-on.gif";

var earth_off = new Image();
earth_off.src = "/speakout/images/global/sitenav-earth-off.gif";
var earth_on = new Image();
earth_on.src = "/speakout/images/global/sitenav-earth-on.gif";

var schools_off = new Image();
schools_off.src = "/speakout/images/global/sitenav-schools-off.gif";
var schools_on = new Image();
schools_on.src = "/speakout/images/global/sitenav-schools-on.gif";

var health_off = new Image();
health_off.src = "/speakout/images/global/sitenav-health-off.gif";
var health_on = new Image();
health_on.src = "/speakout/images/global/sitenav-health-on.gif";

var about_off = new Image();
about_off.src = "/speakout/images/global/sitenav-about-off.gif";
var about_on = new Image();
about_on.src = "/speakout/images/global/sitenav-about-on.gif";

function activate(imgName) {
  if ( eval(imgName + "_on.complete") ) {
    document.images[imgName].src = eval(imgName + "_on.src");
  }
}

function deactivate(imgName) {
  if ( eval(imgName + "_off.complete") ) {
    document.images[imgName].src = eval(imgName + "_off.src");
  }
}