add multiple attachments to my existing php scripts

I have 2 php form to email scripts that work perfectly and they both have the ability to add 1 attachment and email it. They pickup a field in my html form called attachment. I would like it so I can add more fields on my html form like attachment1, attachment2 etc to users can email in more than 1 thing. The part I need altered for this to happen is in the 2 php scripts. Both versions of my php scripts are enclosed as well as the html form. With the php scripts if you open [login to view URL] and look on line 135 and in [login to view URL] line 96 you can see where the attachment settings are. I have tried to just duplicate this area but I cant get it to work. It also needs to keep the size limit part intact as well. This new addition must work like my current one does by browsing for a file in the html form and then the php script just emails it off with the rest of the form contents. The attachment MUST NOT but uploaded to the server first because my server does not allow this, it all has to be email direct from the php script. Thanks Graham