Check if an html element is hidden using jQuery

Well, sometimes we need to calculate width and so on. In my next post I will write about how to fix auto-resize on fixed sized master pages. But now: a very nice stuff: how to check if an element is hidden or not:

$("#s4-leftpanel").is(":visible")
```It is a pure poetry. It reminds me of the beauty of [symbols in Ruby](http://rubylearning.com/satishtalim/ruby_symbols.html).

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