I'd like to integrate a text increase/decrease feature on my html pages. I researched this and found that the current crop of JS code require the inline use of "font-size:12px" or something similar. My pages all have the font sizes in an external CSS file.

I'm going to use this functionality in an app for the iPhone and Android platforms using HTML, CSS, and JS. I'll abandon it, though, if I have to add the font-size to all my paragraphs across hundreds of pages.

Is there a way to add an external JS file that works on pages where the font size is determined by a CSS file? I want it to work just on my <p> text, so it doesn't have to be elaborate. No cookies on these devices, so it will have to work page by page.

Thanks for any answers.