Every front-end developer should be concerned about their web site load times and do whatever they can to improve their users experience. With a little knowledge of ways to optimize your web site maybe there are some improvements that you can make.
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There is a pretty high chance that you've already heard about these web sites if you are a designer and live on the web. If you haven't, here is a list of galleries you can visit for inspiration.
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You have spent time designing your web site. Now spend time designing your dialog boxes. Here is a way to create them using CSS and JavaScript.
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AJAX stands for "Asynchronous JavaScript and XML". What AJAX lets you do is send and receive data to and from a remote source, and render it in your application, without reloading the page.

If you know your JavaScript this will be a piece of cake for you. If you don't know JavaScript you should start by mastering that. As this is a beginners guide I'll keep things simple and demonstrate with an easy example.
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What are sprites?

I would explain it like this: Multiple graphics in a single image file.
I.e. both the "before" and "after" graphics of a rollover effect or all your icons in a single image file and then using techniques to position the image in such a way that only the desired portion is visible.
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