getElementsByClassName on prototype

Hi there,
Completely stuck with a trivial issue i suppose.
I use the prototype library
I have an element and want to get all its child elements with class 'rooms' and do something with each.
What i do is the following code and i get an error el.getElementsByClassName(".rooms").each is not a function
el.getElementsByClassName(".rooms") return an HTMLcollection...How on earth can i manipulate the elements of this collection?

thanks

el.getElementsByClassName('.rooms').each(function(e){
				//do something
			});

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ioustinos_sarrisAsked:
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cyberstalkerCommented:
You can loop through all the elements with a for loop
var elements = el.getElementsByClassName('.rooms');
 
for (var i = 0; i < elements.length; i++)
{
    // do something with elements.item(i)
}

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