Macbook Air Won't Boot from USB Stick

I'm having an issue all of the sudden with trying to restore Lion on my Air. I've been messing around with partitions and setting up triple boot (linx,windows,mac). I had it working but wanted to remove it all and try again. Ultimately if I can just fix the partitions that's all I'd need to do, but I couldn't figure out how to do that so I figured if I just re-installed Lion completey it would fix it.

The current status of my partitions looks like this:

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk0

1: Apple_HFS Macintosh HD 90.4 GB disk0s1

2: EFI 209.7 MB disk0s2

3: Apple_HFS TMP 30.3 GB disk0s3

I can't seem to merge disk0s1 and disk0s3 because the EFI partition is in the middle and can't be changed.

When I boot my air, and try to boot from a USB stick that has the Lion installer on it, I get a picture of a circle with a line through it. Kinda like a no smoking sign except no cigarette.

So I have a couple questions:

-Is there a way to fix the partitions?

-Did something I do to the partitions effect me being able to boot from another device?

-Is there anyway to do target disk mode with a macbook air? (if so can I do that erase the drive and install Lion on it?)

Thanks!