/*preload*/
var img1 = new Image;
var img2 = new Image;
var img3 = new Image;
var img4 = new Image;

img1.src = "/images/topnav/on/about_us.gif";
img2.src = "/images/topnav/on/services.gif";
img3.src = "/images/topnav/on/success.gif";
img3.src = "/images/topnav/on/news-events.gif";

function mainmenu(index,state) {
  var imgobj = document.getElementById("mm"+index);
  if(imgobj != undefined) {
    if(state == 0) {
      imgobj.src = imgobj.src.replace("/on/","/off/");
    } else {
      imgobj.src = imgobj.src.replace("/off/","/on/");
    }
  }
}