function getElementsByClass(searchClass,node,tag)
{
   var classElements = new Array();

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