Mail with attachment

hi
i have a script in sh/ksh
in the script i am making 2 files that i want to mail out at the end of the script
one file need to be an attachment and the other should be the body of the mail

i have tried to find a way do to it and the only way i found worked on SUN and AIX platform

i need my script to run on HP-UX and HP-ITANIUM also

my mail commands that i have on my servers are:
mail ,mailx,sendmail

the method i found is as follows:

attach_file=attchment.txt #the attachment
body=output.txt #the body
uuencode $attach_file $attach_file > temp_attachment
cat $body $temp_attachment > combination_file
mail -s "the subject" <mail_to> < combination_file
rm -fr temp_attachment combination_file

again this works only in AIX and SUN

please help to provide some solution for HP platform

10x

the problem is with the flag -m
-m Do not add MIME header lines Mime Version, Content
Type & Content Encoding to the header information
while sending mails.

in HP we need to add flag -m to mailx command
in SUN and AIX this is the default