How do i move itunes to external hard drive to free up space on my imac

I keep running out of space on my imac (320mb)
I have my movies on a Lacie hard drive.
How do I put itunes on the hard drive?
Thanks

iTunes has many components.  The two main ones are the application itself (which is what ones means when ones says "iTunes") and the library which is a set of files and folders.  I take it you want to move the iTunes library (you cannot run iTunes the application off a non-boot drive).
iTunes: How to move [or copy] your music to a new computer [or another drive] - http://support.apple.com/kb/HT4527
Quick answer if you use iTunes' default preferences settings:  Copy the entire iTunes folder (and in doing so all its subfolders and files) intact to the other drive.  Open iTunes and immediately hold down the Option (alt) key (shift on Windows), then guide it to the new location of the library.
My one hesitation regarding the above is it sounds like you already have some things on the external drive and you have not shared with us the details of your setup.  You have already modified itunes from its standard behavior and this can sometimes introduce problems.

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