Her er en mere hvis den første ikke virker (har ikke testet den første... men havde jo lavet denne før jeg så posten så kan ligeså godt poste denne også...)
<html><head><script type="text/javascript" language="javascript">
function popit(pict){pict=document.getElementById(pict).value;
popins=window.open("","popins","width=300,height=200,status=no,toolbar=no,location=no,directories
=no,resizable=no,menubar=no");
popins.document.write('<html><head><title>Din titel</title><script type="text/javascript"
language="javascript">function
resizepopit(){pich=document.getElementById("pictpopit").scrollHeight;picw=document.getElementById
("pictpopit").scrollWidth;if(pich>screen.availHeight)pich=screen.availHeight;if(picw>screen.avail
Width)picw=screen.availWidth;window.resizeTo(picw,pich);window.moveTo((screen.availWidth-picw)/2,
(screen.availHeight-pich)/2)}<\/script></head><body style="margin:0px;padding:0px;"><img
id="pictpopit" src="'+pict+'" onLoad="resizepopit();"></body></html>');
}
</script>
</head>
<body>
<form>
<input type="text" value="/images/billede.jpg" id="billede" name="billede">
<button class="inputget" title="Vis billede" onClick="popit('billede');"><img border="0"
src="images/ikoner/eye.gif"></button></form>
</body>
