// педварительная загрузка картинки
var dn
  img1=new Image(); img1.src="gotohome2.gif";
  img2=new Image(); img2.src="gotoabout2.gif";
  img3=new Image(); img3.src="gotodanfoss2.gif";
  img4=new Image(); img4.src="gotowhat2.gif";
  img5=new Image(); img5.src="gotoeconomy2.gif";
  img6=new Image(); img6.src="gotocat2.gif";

function init() {
  if (!document.getElementById) return
  var imgOriginSrc;
  var imgTemp = new Array();
  var imgarr = document.getElementsByTagName('img');
  for (var i = 0; i < imgarr.length; i++) {
    if (imgarr[i].getAttribute('hsrc')) {
        imgTemp[i] = new Image();
        imgTemp[i].src = imgarr[i].getAttribute('hsrc');
        imgarr[i].onmouseover = function() {
            imgOriginSrc = this.getAttribute('src');
            this.setAttribute('src',this.getAttribute('hsrc'))
        }
        imgarr[i].onmouseout = function() {
            this.setAttribute('src',imgOriginSrc)
        }
    }
  }
}
onload=init;