how do i join two video clips together?

[dronzer]

i've a lot of small video clips in mpeg,asaf and a few in avi format,what i want to do is join them together so they become a large file rather then a 2mb here and a 5mb there,but when i tried to do this in tmpgenc i got a message that says the bitrates are diffrent and i can't join them together,is there any way around this?
p.s i am new to this so i apologise if this sounds a bit thick headed

[MOVIEGEEK]

Using TMPGEnc:
Encode all files individually at same bitrate,resolution,etc. then Multiplex.

[mategal]

for avis use vdub apeend avi segment or simply windows commander merge

[dronzer]

i've just done what moviegeek told me to do and the result was'nt what i expected,after multiplex the two files became one but only the first file plays back,i guess i did'nt explain what i wanted clearly,i want to take a 5 minute clip and a 3 minute clip so that it becomes a 8 minute clip,after the the 5 minutes the 3 minute clip starts playing and so on if i join more together,the good news is that i've learned how to get past the bitrate problem

[digitalmaster]

deleted

[dronzer]

well i've managed to figure it out myself so thanks anyway but what did you mean by posting "deleted" digitalmaster? i hope you were'nt dissing me because i don't know much about stuff like this,or are you one of those funny guys who post silly posts and make peaple laugh