Are you using IE/XP? I'm thinking it's because of different zone (Internet zone on about:blank page and Local Intranet zone on your page). Regarding the other error, I don't have any idea. Try this sample page:
<html>
<head>
<title>Popup Image Viewer</title>
<script type="text/javascript">
function popImg(imageURL) {
var imgWin = window.open('about:blank','imgWin','width=200, height=200, left=100, top=100');
with (imgWin.document) {
writeln('<html><head><title>Loading...</title>');
writeln('<style type="text/css"><!-- body { margin: 0px; } --></style></head>');
writeln('<body onload="self.focus();"><img id="pic" style="display:none" /></body></html>');
close();
}
var img = new Image();
img.onload = function() { sizeImgWin(imgWin, img) };
img.src = imageURL;
return false;
}
function sizeImgWin(win, img) {
var new_w = img.width;
var new_h = img.height;
var old_w = win.innerWidth || win.document.body.offsetWidth;
var old_h = win.innerHeight || win.document.body.offsetHeight;
if (!new_w) { new_w = old_w; }
if (!new_h) { new_h = old_h; }
new_w -= old_w; new_h -= old_h;
win.resizeBy(new_w,new_h);
win.document.title = img.src.substring(img.src.lastIndexOf("/")+1);
var pic = win.document.getElementById('pic');
pic.src = img.src;
pic.style.display = 'block';
}
</script>
</head>
<body>
<a href="test.jpg" onclick="return popImg(this.href);">test</a>
</body>
</html>
Of course, you need to change the href to a valid image. I tested it with IE6/Win2K and Firefox and both worked.
If the first problem persist, then you may resort to creating a dummy page.
var imgWin = window.open('dummy.htm', ...