Add line to mulptile pages

I need to add a line in the head to about 100 pages. Is there a way to do it quickly to the entire site without having to manually update every page?

Thanks.

"Edit-->Find and Repleace"
find the code and repleace it with the new code in "entire site" or a "page"....the gui is pretty intuitive.
Backup prior to adding carrots and other vegetables :-)