You could always add a javascript (after loading complete) to determine the image's width, and resize if it is determined to be above your maximum...
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More specifically, the validator is looking at the background color, and comparing it against every foreground element. <p>, text, <h3>, etc. Note that it may not take into consideration that your...
The trick is to only specify ONE dimension, and then it will scale proportionally. As for getting it to a percentage... EMaks is correct, you need a value to scale...
Well, the one thing I did note when originally reading your example... you coded "panel", but in your jquery you use "panes"... Is that a typo? It would explain the problem...
Yeah, and if you want the reason, it's to keep malicious developers from scripting a malicious site... Imagine - a visitor lands on a page, but it shows an error message, and says it will forward you...