Here are some of the choices available to you when you use an IFRAME.

align choices are left, right, middle, top, and bottom. Also, absbottom, absmiddle, texttop, and baseline.

vspace = the height of the margin in pixels.
hspace = the width of the margin in pixels.

marginwidth = width in pixels
marginheight = height in pixels
scrolling = yes, no, or auto
frameborder = 1 or 0