Assign CSS Pseudo class with Javascript

I want to know how to modify a css hover pseudo class with javascript.

I can use document.getElementById(“el”).className to assign a predefined class to an element, but thats about all I know.

If the element is

<a href=”1.htm” id=”el”>

How do assign the links peudo classes, hover, link and visisted using javascript?

Hope someone can help!

Thanks,

Tim.

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