function init(navimg, navimgover, navimgon, len, wid, fmt)
 {
 eval (navimg+" = new Image("+len+","+wid+")");
 eval (navimg+".src = './images/"+navimg+"."+fmt+"'");
 eval (navimgover+" = new Image("+len+","+wid+")");
 eval (navimgover+".src = './images/"+navimgover+"."+fmt+"'");
 if (navimgon != '')
  {
  eval (navimgon+" = new Image("+len+","+wid+")");
  eval (navimgon+".src = './images/"+navimgon+"."+fmt+"'");
  }
 eval (navimgover+"w = new Image()");
 return true;
 }

function rollover(place,imagename,stat)
 {
 document[place].src = eval(imagename+".src");
 if (stat == 'over')
  {window.status = eval(imagename + 'w');}
 else
  {window.status='Document: Done';}
 }

function popup(loc,w,h)
 {
 window.open(loc,'Popup','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=no,width='+w+',height='+h+'');
 }

function backbutton()
 {
 if (navigator.appName == 'Netscape' && navigator.appVersion.substr(0,1) < '5')
  {
  back();
  }
 else
  {
  window.history.back();
  }
 }