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("(^| )" + searchClass + "( |$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}

function isClass(sClass) {
  sClassName = document.body.className;

  re = new RegExp(sClass + "( |$)") 

  if (!sClassName)
    return false;
  return re.test(sClassName);
}