get class function vanilla js IE8 friendly

get_class

getClass = function(Cname) {
    var elements = document.getElementsByTagName('*'), i,classElems = [];
    for (i in elements) {
      if ((" " + elements[i].className + " ").indexOf(" "+Cname+" ") > -1) {
          classElems.push( elements[i] );
      }
    }
    return classElems;
};