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§ Don't AJAX an image!

Using AJAX is fine when you need it, but I've used AJAX to simply reload CAPTCHA images.  Boy, some people are dumb!  Me, in particular.

UPDATE:  I'm dumber than I thought...

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§ Simple AJAX request

Almost all of my AJAXing is to simply grab the output of a source and stuff it in in a div.  In previous posts you can see what I've been using for a long time, but I wanted to make a function I wouldn't have to edit every time I used it in a project.

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§ Use iframe contents to change iframe to ajax div

This php file, used as an iframe's content, will attempt to load javascript to the parent to replace the iframe with a div, then ajax its content to that div.

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The first principle of the military analyst is to figure out how the enemy can hurt you worst with his known capabilities and then plan to stop him, not hope he won’t try it.
Early Honor Harrington series, David Weber