getComputeStyle IE support. getcomputedStyle(element, pseudo class)

computedStyle.js

// http://stackoverflow.com/questions/15733365/cross-browser-ie8-getcomputedstyle-with-javascript#comment23187887_15733365
// http://snipplr.com/view/13523/
if (!window.getComputedStyle) {
  window.getComputedStyle = function(el, pseudo) {
    this.el = el;
    this.getPropertyValue = function(prop) {
      var re = /(\-([a-z]){1})/g;
      if (prop == 'float') prop = 'styleFloat';
      if (re.test(prop)) {
        prop = prop.replace(re, function () {
            return arguments[2].toUpperCase();
        });
      }
      return el.currentStyle[prop] ? el.currentStyle[prop] : null;
    }
    return this;
  }
}