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Get div id from its class name

How can I find id based on its class just using javascript. I know this easily with jQuery , what is the solution .. using getElementsByTagName?

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document.getElementsByClassName('myClassName')[0].id

or

 document.querySelector('.myClassName').id
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The first step would be to find the element with the given class name. There are currently some features supported by modern browsers, such as the getElementsByClassName and querySelector . but they are not cross browser solutions.

That is, getElementsByClassName not supported by IE 6-8, and querySelector not supported by IE6-7 & FF3
source: http://www.quirksmode.org/dom/w3c_core.html

Therefore, if you do not support these browsers, you can use them, otherwise you will need a js shell function similar to the one mentioned in this post originally found on justswell.org .

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