//change the "fontSize" property of all the elements with class "className"

function setTextSize(className, size) {

	var elements = document.getElementsByClassName(className);

	var children;

	

	for ( var i=0; i<elements.length; i++ ) {

		elements[i].style.fontSize = size + "pt";

		

		if (elements[i].childNodes != null) {

			children = elements[i].childNodes;

			for ( var k=0; k<children.length; k++ ){

				if (children[k].style != null)

					children[k].style.fontSize = size + "pt";

			}

		}

		

	}

}