I’m so use to using jQuery that I usually don’t have to look up documentation on how to use certain functions. They almost come naturally because it’s so English-like! Unfortunately Magento uses Prototype as it’s native choice of Javascript Frameworks. I sure wish they would have chosenjQuery! I think they would have more people jumping on their platform. I’m sure they have a good choice for it. Anyway, here’s how to check:

You may want to check if a user is logged in with Magento, possibly to display a link or promotional item. Here’s how to do it:

Magento is a pretty flexible platform. That flexibility comes with a price though; You have to be knowledgeable of the functions that are available to you to utilize. Finding or knowing them is a challenge though. Here is one of those such functions that you may need to display the product Sku on a category page.