function lastmodified(){
var modifieddate = document.lastModified;
var md = new Date(modifieddate)
var result =  md
var dayofmonth = md.getDate(modifieddate) 
result = dayofmonth
result += "/"
result += md.getMonth(modifieddate)+1
result += "/"
var year =md.getYear(modifieddate)
result += year
result +=" "
var hours = md.getHours(modifieddate)
result += hours
result +=":"
var minutes = md.getMinutes(modifieddate)
result += minutes
result +=":"
var seconds = md.getSeconds(modifieddate)
result += seconds
return result
}

if (document.images) {
    
  homeon = new Image();
  homeon.src = "images/btnhome_ovr.gif";

  homeoff = new Image();
  homeoff.src = "images/btnhome.gif";
  
  abton = new Image();
  abton.src = "images/btnabout_ovr.gif";

  abtoff = new Image();
  abtoff.src = "images/btnabout.gif";
   
  funon = new Image();
  funon.src = "images/btnfunc_ovr.gif";

  funoff = new Image();
  funoff.src = "images/btnfunc.gif";
  
  stron = new Image();
  stron.src = "images/btnstruc_ovr.gif";

  stroff = new Image();
  stroff.src = "images/btnstruc.gif";
  
  facon = new Image();
  facon.src = "images/btnfac_ovr.gif";

  facoff = new Image();
  facoff.src = "images/btnfac.gif";
  
  achon = new Image();
  achon.src = "images/btnach_ovr.gif";

  achoff = new Image();
  achoff.src = "images/btnach.gif";

  pcon = new Image();
  pcon.src = "images/btnpc_ovr.gif";

  pcoff = new Image();
  pcoff.src = "images/btnpc.gif";

  trainon = new Image();
  trainon.src = "images/btntrain_ovr.gif";

  trainoff = new Image();
  trainoff.src = "images/btntrain.gif";

  fpon = new Image();
  fpon.src = "images/btnfp_ovr.gif";

  fpoff = new Image();
  fpoff.src = "images/btnfp.gif";
  
}

function chgImages() {
  if (document.images) {
    for (var i=0; i<chgImages.arguments.length; i+=2) {
      document[chgImages.arguments[i]].src = eval(chgImages.arguments[i+1] + ".src");
    }
  }
}