// show a div
function Show(divname)  {
  if(ie4 || ie5)  {
    eval('document.all.'+divname+'.style.visibility=\'visible\'\;');
    }
  else if (ns4){
    eval('document.'+divname+'.visibility = \'visible\'\;');
    }
  else if (ns6){
    eval('document.getElementById(\''+divname+'\').style.visibility = \'visible\'\;');
    }
  }

// hide a div
function Hide(divname)  {
  if(ie4 || ie5)  {
    eval('document.all.'+divname+'.style.visibility=\'hidden\'\;');
    }
  else if (ns4){
    eval('document.'+divname+'.visibility = \'hide\'\;');
    }
  else if (ns6){
    eval('document.getElementById(\''+divname+'\').style.visibility = \'hidden\'\;');
    }
  }