Attachment viewer (iframe) is too small in Safari/Opera/IE7

[memoryhole]

When viewing attachments (particularly PDFs, but also other things), a preview window is displayed. Embedded in this window is an iframe that contains the actual attachment. Unfortunately, this iframe is absurdly small on many non-Firefox browsers, including IE7, Opera, and Safari.

The attached two patches make the iframe full size in both Opera and Safari, and enlarges it horizontally on IE7. There seems to be some sort of bug in IE7 that prevents the iframe from filling the space vertically. Firefox's behavior is unaffected, and remains correct.

[memoryhole]

CSS fix allowing iframe to be larger

[memoryhole]

HTML fix making the attachment viewer fill the vertical space (except on IE7)

[thomasb]

Fixed in r1027