[CentOS] sed with several lines, how?

Sat Nov 27 11:39:00 UTC 2010
Arthur Bela <jozsi.avadkan at gmail.com>

hyphen's [ - ] are just for marking the start/end of a pattern, but
there are _not in_ the pattern!
"OUTPUT" is what i want after "seding" the PATTERN#X's


so i for e.g.: need the first, and second "magic"
sed "FIRSTMAGIC" PATTERN#1
sed "SECONDMAGIC" PATTERN#2




PATTERN#1:

-----------------------------------
SOMETEXT#1
<br><font size=3>SOMETEXT#2</font><br>
<br><font size=3>SOMETEXT#3</font><br>
SOMETEXT#4
-----------------------------------

"exact pattern", what is unique from the pattern:
-----------------------------------
</font><br>\n<br><font size=3>
-----------------------------------

OUTPUT:
-----------------------------------
SOMETEXT#1
<br><font size=3>SOMETEXT#3</font><br>
SOMETEXT#4
-----------------------------------





and:

PATTERN#2:

-----------------------------------
SOMETEXT#1
<br><font size=3>SOMETEXT#2</font><br>
</font></div></body></html>
SOMETEXT#3
-----------------------------------

"exact pattern", what is unique from the pattern:
-----------------------------------
</font><br>\n</font></div></body></html>
-----------------------------------

OUTPUT:
-----------------------------------
SOMETEXT#1
</font></div></body></html>
SOMETEXT#3
-----------------------------------


i just can't figure it out, how to "sed" when having several lines
[nor in awk, perl..]

could anyone post a link, or some guide, how to write these two lines of "sed"?

Thank You! :\