edited image not being saved and displayed properly

[SUBSCRIBE MAPSERVER-USERS mapuser]

hi,
how can i set the bounding box values, what is the bounding box? is it 
not the same i.e. extent? 

well the tutorial uses the url:
href="/cgi-bin/mapserv.exe?
map=/ms4w/apps/tutorial/htdocs/example1-
9.map&layer=states&layer=modis">Example 1.9- The difference 
between map and browse mode</a>

it has not set any extent values initially, in the url. i am using the same 
url.

i have also tried by setting the extent to the full extent of my table in 
the mapfile. and it loads the full data initially, but with the same 
problem of empty image being loaded on the click, and which is what is 
saved in the tmp file.

i have altered the mapfile as u recommended. please clear the 
bounding box problem.

thanks for helping