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access a css class with javascript?

Hello Experts,
Is it possible to access a css class with javascript? I have been researching it but it seems to not be related to html/css classes.

I would like to do something like this but menuBar2 is a class, not an id.
document.getElementById("menuBar2").style.backgroundColor = "#06F";

Is it possible?
Thanks,
rhyno99

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Rikin Shah

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laurent_roy

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Albert Van Halen

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rhyno99

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Wow, there seems to be a lot of ways to approach this. I may want to restructure what I am trying to do to make it work best . Right now this may be the most simple solution. The problem is I don't understand how this would fit with this. If MyElement is a class, then it can't "get it", right?

document.getElementById("MyElement").className = " MyClass";
}

document.getElementById("menuBar2").style.backgroundColor = "#06F";

Thank you everyone for the tips. I will need to continue to review these examples to see what will work best. Sorry, I am new at this and a bit slow to understanding the scripts.

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akila111086

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rhyno99

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Thank you all for your help.