function getElementsByClass(node,searchClass,tag) {
	var classElements = new Array();
	var els = node.getElementsByTagName(tag); // use "*" for all elements
	var elsLen = els.length;
	var pattern = new RegExp("\\b"+searchClass+"\\b");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
		j++;
	}
}
	return classElements;
}

function setFontSize(tagtype,classname,fontsize) {
	var array1 = getElementsByClass(document,classname,tagtype);
	
	var c = 0;
	while (c < array1.length) {
		array1[c].style.fontSize = fontsize;
		c++;
	}
}