<li id="MyId1" onclick="MyFunction(this);" >Hello</li>
<script>
function MyFunction (CallingElement) {
var CallingElementId = CallingElement.id;
document.getElementById(CallingElementId).className = "MyClassName";
}
</script>Feel free to comment if you can add help to this page or point out issues and solutions you have found. I do not provide support on this site, if you need help with a problem head over to stack overflow.