var ie=document.all
var ns6=document.getElementById&&!document.all
function ietruebody(){
return (document.compatMode && document.compatMode!="BackCompat" && !window.opera)? document.documentElement : document.body
}

function enlarge(which, e, imgwidth, imgheight){
if (ie||ns6){
crossobj=document.getElementById? document.getElementById("showimage") : document.all.showimage
pgyoffset=ns6? parseInt(pageYOffset) : parseInt(ietruebody().scrollTop)
horzpos=ns6? pageXOffset+window.innerWidth/2-imgwidth/2 : ietruebody().scrollLeft+ietruebody().clientWidth/2-imgwidth/2
vertpos=ns6? pgyoffset+window.innerHeight/2-imgheight/2 : pgyoffset+ietruebody().clientHeight/2-imgheight/2
if (window.opera && window.innerHeight) //compensate for Opera toolbar
vertpos=pgyoffset+window.innerHeight/2-imgheight/2
vertpos=Math.max(pgyoffset, vertpos)

crossobj.style.left=horzpos+"px"
crossobj.style.top=vertpos+"px"
crossobj.innerHTML='<img src="'+which+'" width="'+imgwidth+'" height="'+imgheight+'" onClick="closepreview()" title="Klik om te sluiten">'
crossobj.style.visibility="visible"
return false
}
else //if NOT IE 4+ or NS 6+, simply display image in full browser window
return true
}

function closepreview(){
crossobj.style.visibility="hidden"
}