topmargin - leftmargin alternatives

Hi, is there a css equivalent to leftmargin - topmargin  (for IE) - 
marginwidth and marginheight (for NN)?  I have received some pages (not 
frameset) to redesign and the original html markup (no css at all) uses the 
above four attributes in the body tag to bring a large graphic to the 
*very* top and left of the browser window - as it must be to look right.

I'm advised that these are not "legal" html/xhtml attributes and I'm 
wondering what options - css preferred - might serve the same 
purpose.  I've tried css margin-top set to zero and it did not 
work.  Perhaps a negative value?  Same for margin-left css selector.  The 
graphic still drops x pixels from the top of the browser and does not look 
right.  Should be simple to solve, but it's escaping me.  Any help appreciated.
Ralph Rasmussen  

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