Better method to convert pixels to ems

Don't know if my Dreamweaver CS5 can help me do this:
I'm experimenting with making my site more accessible for vision-impaired people by using ems in my CSS style sheet for image sizes as described at http://sperling.com/examples/zoom/
The problem I have is calculating the ems. I have to open the image in Photoshop, use Image Size to figure what the height and width pixels would be at a slightly smaller size, then go to an online site that lets me convert pixels to ems. What a hassle. Shorter path?
- Keith Purtell

First you must establish the base font-size in your CSS like so: This assumes 1em = 100% = 16px (standard browser default).
html {font-size: 100%}
body {font-size: 1em}
Then define your page layout and division widths in ems using the following formula:
1 divided by 16 = 0.0625
multiplied by the number of pixels required
= value in ems.
0.0625 X 900px = 56.25em
0.0625 X 300px = 18.75em
0.0625 X 150px = 9.375em
#wrapper { width: 56.25em}
#divName {width: 18.75em}
#divName img {width: 9.375em; height: 9.375em}
IMPORTANT! If you don't wrap elastic images inside elastic containers, your page will fall apart when people increase text size in browser.
You can see a working DEMO of this method here:
http://alt-web.com/TEST/Resizable-ems-test.html
Good luck,
Nancy O.
Alt-Web Design & Publishing
Web | Graphics | Print | Media Specialists
http://alt-web.com/
http://twitter.com/altweb

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