var isNS = document.layers?true:false;
var isIE = document.all?true:false;
var isDOM = document.getElementById?true:false;

function show(id)
{
 if (isNS) document.layers[id].visibility = "show";
 else if (isIE)
 {
  document.all[id].style.visibility="visible";
//de 100 geeft de doorzichtigheid aan. 
  setTimeout("doFadeIn('"+id+"',100)",1000);
 }
 else if (isDOM) document.getElementById(id).style.visibility="visible";
}

function hide(id)
{
 if (isNS) document.layers[id].visibility = "hide";
 else if (isIE)
 {
  // document.all[id].style.visibility="hidden";
  setTimeout("doFadeOut('"+id+"',100)",1000)
 }
 else if (isDOM) document.getElementById(id).style.visibility="hidden";
}

function doFadeIn(fadeName,maxPct)
{
 var fadeObj = document.all[fadeName]
 if ((fadeObj.filters.alpha.opacity + 6) <= maxPct)
 {
  fadeObj.filters.alpha.opacity += 6;
  setTimeout("doFadeIn('" + fadeObj.id + "'," + maxPct + ")",30)
 }
 else fadeObj.filters.alpha.opacity = maxPct;
}

function doFadeOut(fadeName,maxPct)
{
 var fadeObj = document.all[fadeName]
 if ((fadeObj.filters.alpha.opacity - 8) >= 0)
 {
  fadeObj.filters.alpha.opacity -= 8;
  setTimeout("doFadeOut('" + fadeObj.id + "'," + maxPct + ")",30)
 }
 else fadeObj.filters.alpha.opacity = 0;
}