I think what you want is style="float:left" around the picture. We have a bbcode for that with this replacement (we used tag floatl):
HTML Code:
<div style="float: left;margin: 10px 10px 10px 0px;">{param}</div>
...but I can't remember where we got it - it might have been posted on this site and/or we may have changed it (I seem to remember putting in the margin thing).
Anyway, the code would then be [floatl][img]whatever[/img][/floatl]TEXT TEXT TEXT etc