Here is the border attribute:
<<>img src="URLofIMAGE" border="0"<>> indicates how large of a border or none at all.
Here are the size attributes:
<<>img src="URLofIMAGE" border="0" width="468" height="60"<>> 468 x 60 is a standard banner size, that I used as an example. The width and height attributes allow the browser to know how large the image is going to be, so it doesn't have to take time for it to figure out for itself.