var getStyleProperty = (function(){
  var prefixes = ['Moz', 'Webkit', 'Khtml', 'O', 'Ms'];
  function getStyleProperty(propName, element) {
    element = element || document.documentElement;
    var style = element.style,
        prefixed;
    // test standard property first
    if (typeof style[propName] == 'string') return propName;
    // capitalize
    propName = propName.charAt(0).toUpperCase() + propName.slice(1);
    // test vendor specific properties
    for (var i=0, l=prefixes.length; i<l; i++) {
      prefixed = prefixes[i] + propName;
      if (typeof style[prefixed] == 'string') return prefixed;
    }
  }
  return getStyleProperty;
})();