Lightboxes are best implemented with large-scale banners since they can utilize a good portion of the browser window area, but you don't want to go too large as not all users will have high-resolution screens!
We recommend serving 300x600 or 550x480 banners to desktop/laptop users and tablet users since they fit nicely on all such screens.
Smaller sizes such as 300x250 or 180x150 can be substituted for mobile phones users, which will improve the usability of your web site on those devices.
Quirks Mode Considerations
If your web site happens to render in Quirks Mode you will need to correct that in order for the lightbox to show up correctly in Internet Explorer, however, this can usually be accomplished by simply specifying a doctype if one is missing or by switching to a standards compatible HTML doctype.
The HTML5 doctype as well as all of the XHTML 1.0 or 1.1 doctypes, which are the most commonly used for modern or relatively modern web sites are already rendered in standards compliant mode and require no changes.
On older web sites that use HTML 4.01 you must use the complete doctype with system identifier which would be one of the following:
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