Stoopid Photoshop question - overlaying shorter exposed core

[niko]

I'm blaming the clouds for having such litle opportunity to process data for having forgotten this!

I have a 2min exposure of the Tarantula and want to overlay that core on to the 5min sub I have but can't remember how to do it

Doh!

Also, the 5min sub is the background that shows it's locked - is that a drama?

thanks guys

signed,

stuck in Geelong and feeling dim

[TheDecepticon]

Hope the link works.

http://www.astropix.com/PFA/SAMPLE4A/SAMPLE4A.HTM

[niko]

many thanks