The options are top, texttop, middle, absmiddle, bottom, absbottom, and baseline. These may vary in appearance according to the browser used. The default alignment aligns text with the bottom of the image. Align can also specify right or left. These attributes tell the browsers to place an image against the right or left margin of the text.
Space is measured in pixels.
The center tag is used in the same manner as for text. However, be aware that then your viewers may not recognize it as a link. Sometimes users will turn off the option to load images automatically if their connection is slow. Some browsers do not support images at all. You can create text that will appear even if the image does not.