Css attribute change with javascript

<div id="myElement">Welcome on my site!</div>
<a href="javascript:changeClass()"&gtChange Class</a>
<script language="javascript">
function changeClass(){
document.getElementById("idElement").setAttribute("class", "myClass");
}
</script>



document.getElementById("idElement").setAttribute("class", "className");

http://woork.blogspot.in/2008/01/change-class-attribute-using-javascript.html

http://stackoverflow.com/questions/7941276/how-to-change-the-class-of-a-div-when-clicking-on-it

http://www.ezineasp.net/post/Javascript-Change-Style-Class-of-Div-tag.aspx