function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}


function addClass(element, value) {
	
if(!element.className) {
element.className = value;
} else {
newClassName = element.className;
newClassName+= " ";
newClassName+= value;
element.className = newClassName;
}

}


function removeClass(element,value) {
  return element.className = element.className.replace( new RegExp('(^|\\s)' + value + '(\\s|$)') ,' ');
}