function preloadArray(dir,arrayName) {
  if (document.images) {
     for (var i=0; i<eval(arrayName+'.length'); i++) {
     CURR_ARRAY_ITEM = eval(arrayName+'[i]');
     eval(CURR_ARRAY_ITEM+'_on = new Image()');
     eval(CURR_ARRAY_ITEM+'_on.src = dir+"'+CURR_ARRAY_ITEM+'_on.gif";');
     eval(CURR_ARRAY_ITEM+'_off = new Image()');
     eval(CURR_ARRAY_ITEM+'_off.src = dir+"'+CURR_ARRAY_ITEM+'_off.gif";');
     }
  }
}

var imageList = new
Array('wha','who','how');

preloadArray('img/nav/','imageList');

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

function rollOut(imgName) {
  if (document.images) {
     if (selected != imgName) document.images[imgName].src=eval(imgName + "_off.src");
  }
}

var url = self.location.href;
var bits = url.split('/');

var dir = bits.length - 2;
var directory = bits[dir];

var end = bits.length - 1;
var page = bits[end];

var bobs = page.split('.');
var pageVar = bobs[0];

function access() {
  if ((selected == 'wha') || (selected == 'who') || (selected == 'how')) {
    rollIn(selected);
  }
}

var selected = pageVar.slice(0,3,page);