//=========================
  browserOK = true;
  pics = new Array();

var objCount = 0;
function preload(name, first, second) {  
  if (browserOK) {     
    pics[objCount] = new Array(3);
    pics[objCount][0] = new Image();
    pics[objCount][0].src = first;
    pics[objCount][1] = new Image();
    pics[objCount][1].src = second;
    pics[objCount][2] = name;
    objCount++;}}

function on(name){
  if (browserOK) {
     for (i = 0; i < objCount; i++) {
      if (document.images[pics[i][2]] != null)
        if (name != pics[i][2]) { 
            document.images[pics[i][2]].src = pics[i][0].src;
        } else {
              document.images[pics[i][2]].src = pics[i][1].src;}}}}

function off(){
  if (browserOK) {
     for (i = 0; i < objCount; i++) {
      if (document.images[pics[i][2]] != null) 
            document.images[pics[i][2]].src = pics[i][0].src;}}}

preload("link1", "images/but1.gif", "images/but1m.gif");
preload("link2", "images/but2.gif", "images/but2m.gif");
preload("link3", "images/but3.gif", "images/but3m.gif");
preload("link4", "images/but4.gif", "images/but4m.gif");
preload("link5", "images/but5.gif", "images/but5m.gif");
preload("link6", "images/russ.gif", "images/russm.gif");
preload("link7", "images/engl.gif", "images/englm.gif");
preload("link8", "images/but1_en.gif", "images/but1m_en.gif");
preload("link9", "images/but2_en.gif", "images/but2m_en.gif");
preload("link10", "images/but3_en.gif", "images/but3m_en.gif");
preload("link11", "images/but4_en.gif", "images/but4m_en.gif");