sending HTML (incl. embedded images) to browser

Hi List, I am a PHP newbie, pardon the elementary question - I am starting out with using print() to send HTML to the browser to be rendered. All is well with text and tables and other HTML formatting, but when trying to send IMG tags, my images aren't getting displayed. Is there a good tutorial out there (I can't seem to find it) on how to send HTML to a browser where the HTML includes IMG tags with links to image files? If I need to set up the filepaths with variables I can figure that out, but not sure what functions to use to set the paths up. Thanks for any pointers! -Jake