Change CSS Class

Hi,

I need to change my class, but this isn't doing it for me and I don't see why. No error messages, but nothing happens.

.myClass {
background-color: yellow;
}

document.getElementById("myId").setAttribute("class","myClass");


Thank You in Advance for Your Help,

Lou

Of course after I post a question I get it working.

Thanks for having a look at my question.

Lou

Thu=ought css would be better anyway?