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• align — 'left', 'right', 'bottom', 'center', 'top'.
• border — width of the border (in pixels).
• bordercolor — specify the colour color of the image border created with the "border" tab . Specify the colours by name or by hex value. See more information about web colours. (Available with Confluence 2.6.2 and later.)
• hspace — specify the amount of whitespace to be inserted to the left and right of the image (in pixels).
• vspace — specify the amount of whitespace to be inserted above and below the image (in pixels).
• width — specify the width of the image (in pixels). This will override the Supersedes natural width of the image.
• height — specify the height of the image (in pixels). This will override Supersedes the natural height of the image.
• title — specify alternative descriptive text for the image, which is displayed when the pointer hovers over the image
• alt — specify alternative text, which is included in the HTML code. This text is retrievable via search, and contributes to accessibility of the page for text-only viewing.

Source: http://confluence.atlassian.com/display/DOC/Displaying+an+Image^{Image Removed} May 16, 2008