function hiliteunit(el){
  el.src = el.getAttribute("unitalt");
  var textid = 't'+el.getAttribute("unitno");
  var img = document.getElementById(textid);
  img.src = img.getAttribute("textalt");
}

function hilitetext(el){
  el.src = el.getAttribute("textalt");
  var unitid = 'u'+el.getAttribute("unitno");
  var img = document.getElementById(unitid);
  img.src = img.getAttribute("unitalt");
}

function unhiliteunit(el){
  el.src = el.getAttribute("origsrc");
  var textid = 't'+el.getAttribute("unitno");
  var img2 = document.getElementById(textid);
  img2.src = img2.getAttribute("origsrc");
}

function unhilitetext(el){
  el.src = el.getAttribute("origsrc");
  var unitid = 'u'+el.getAttribute("unitno");
  var img = document.getElementById(unitid);
  img.src = img.getAttribute("origsrc");
}

function hilitesetup(){ 

  var y = document.getElementsByTagName("img");

  for (var i=0;i<y.length;i++){
    
    var unitalt = y[i].getAttribute("unitalt");
    if (!unitalt) continue;

    var unitno = y[i].getAttribute("unitno");
    
    y[i].onmouseover = new Function("hiliteunit(this);this.style.cursor='pointer';");
    y[i].onmouseout = new Function("unhiliteunit(this);");
    
    y[i].setAttribute("origsrc",y[i].src);
     
    }

  for (var j=0;j<y.length;j++){
    
    var textalt = y[j].getAttribute("textalt");
    if (!textalt) continue;

    var unitno = y[j].getAttribute("unitno");
    
    y[j].onmouseover = new Function("hilitetext(this);this.style.cursor='pointer';");
    y[j].onmouseout = new Function("unhilitetext(this);");
    
    y[j].setAttribute("origsrc",y[j].src);
    
  }

}