Wrapping text

What is the best way to get plain text wrapped to a specific line width? I have a file with content-type specified to "text/plain" (it's an email message) and I'd need to wrap it to 72 characters (or whatever) per line for on-screen previewing. It's easy to cut lines after every 72nd character, but I wouldn't like to cut in the middle of the words...
Thanks for your help!

An easy way would be to put the text into a TEXTAREA box with fixed width or inside a TABLE with fixed width for preview purposes.

Peter

No, that's not working here. I want to have plain text file. Actually this probably isn't the only time I need a text wrapping function. If there's no solution ready, I think I must do one myself...