//globals
var NAV_IMAGE_ROOT = 'img/nav/';

function preloadNavImages() {
  var navImages = ['our_company','for_investors','newsroom','publishers','authors','jobs','stores']
  
  //preload images...
  for (var i=0;i<navImages.length;i++) {
    var image = new Image();
    image.src = NAV_IMAGE_ROOT + navImages[i] + '_over.gif';
  }
}

function navOver(which) {
  if (document.images) {
    document.images[which].src = NAV_IMAGE_ROOT + which + '_over.gif';
  }
}
function navOut(which) {
  if (document.images) {
    document.images[which].src = NAV_IMAGE_ROOT + which + '_default.gif';
  }
}