// Rollover Functionality

// define category-specific nav image names
var mainCat = new Array;
mainCat = ["why", "energy", "find", "select", "home","smart","safety","build"];

// preload images referencing mainCat
var imgOn = new Array;
var imgOff = new Array;
for (var i = 0; i < mainCat.length; i++) {
  imgOff[i] = new Image;
  imgOff[i].src = "/img2/btn_"+mainCat[i]+"_off.gif";
  imgOn[i] = new Image;
  imgOn[i].src = "/img2/btn_"+mainCat[i]+"_on.gif";
}

// do rollover
function toggleimg(imgname,state) {
  var ptr = eval("document.images."+imgname);
  ptr.src = "/img2/btn_"+imgname+"_"+state+".gif";
}