myVar = whatever variable is attached to your text box
myVar.scroll = myVar.maxscroll - 2
where 2 is (in your example) one less than the number of lines that can be seen. also i dunno if maxscroll is the last line or the line at the top of the text box when the last line is at the bottom of the text box...just play around. hope this helps, if not check the help files for scroll, and maxscroll...rob