Do not forget to check this :
Window resize events! Image resize…
Browsers based on the Gecko-engine (Mozilla, Netscape 6+, Galeon…), Konqueror 3.2+, Netscape 4, Opera 5+.
Gecko browsers (Mozilla, Netscape 6+, Phoenix…), Netscape 4, Opera 5, 6 and 7, Internet Explorer 4+.
wz_dragdrop.js automatically re-integrates images and relatively positioned layers into the logical structure of the page. That is, back into the page flow even if line-breaks, table-sizes etc. have changed. Items that have previously been dragged keep their relative offset from their – also recalculated – default location within the page flow (accessible, by the way, through the defx and defy properties of each item). That means: A user won’t break the API if they decide to resize their browser window.