var AvvoWidget = {};
AvvoWidget.getElementsByClassName = function (className, tag, elm){
  if (document.getElementsByClassName) {
    getElementsByClassName = function (className, tag, elm) {
      elm = elm || document;
      var elements = elm.getElementsByClassName(className),
        nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
        returnElements = [],
        current;
      for(var i=0, il=elements.length; i<il; i+=1){
        current = elements[i];
        if(!nodeName || nodeName.test(current.nodeName)) {
          returnElements.push(current);
        }
      }
      return returnElements;
    };
  }
  else if (document.evaluate) {
    getElementsByClassName = function (className, tag, elm) {
      tag = tag || "*";
      elm = elm || document;
      var classes = className.split(" "),
        classesToCheck = "",
        xhtmlNamespace = "http://www.w3.org/1999/xhtml",
        namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
        returnElements = [],
        elements,
        node;
      for(var j=0, jl=classes.length; j<jl; j+=1){
        classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
      }
      try {
        elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
      }
      catch (e) {
        elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
      }
      while ((node = elements.iterateNext())) {
        returnElements.push(node);
      }
      return returnElements;
    };
  }
  else {
    getElementsByClassName = function (className, tag, elm) {
      tag = tag || "*";
      elm = elm || document;
      var classes = className.split(" "),
        classesToCheck = [],
        elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
        current,
        returnElements = [],
        match;
      for(var k=0, kl=classes.length; k<kl; k+=1){
        classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
      }
      for(var l=0, ll=elements.length; l<ll; l+=1){
        current = elements[l];
        match = false;
        for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
          match = classesToCheck[m].test(current.className);
          if (!match) {
            break;
          }
        }
        if (match) {
          returnElements.push(current);
        }
      }
      return returnElements;
    };
  }
  return getElementsByClassName(className, tag, elm);
};
AvvoWidget.addEvent = function(obj, type, fn) {
  if(obj.attachEvent) {
    obj.addAttachEvent('on' + type, fn);
  } else {
    obj.addEventListener(type, fn, false)
  }
};
AvvoWidget.onReady = function(fn) {
  if(document.addEventListener) {
    document.addEventListener("DOMContentLoaded", fn, false);
  } else if (document.attachEvent) {
    document.attachEvent("onreadystatechange",
      function() {
        if (document.readyState === "complete") {
          document.detachEvent("onreadystatechange", arguments.callee);
          fn()
        }
      });
    if ((document.documentElement.doScroll) && (window == window.top)) { (function() {
          try {
            document.documentElement.doScroll("left")
          } catch(error) {
            setTimeout(arguments.callee, 0);
            return
          }
          fn()
      })()
    }
  }
};
AvvoWidget.createIframe = function(options) {
  var el = document.createElement("iframe");
  el.scrolling = "no";
  el.frameborder = "0";
  el.style.border = "none";
  el.style.overflow = "hidden";
  el.style.width = options.width + "px";
  el.style.height = options.height + "px";
  el.src = options.url;
  if(el.src.match(/\?/)) {
    el.src = el.src + "&avvo_widget=1&aw_w=" + options.width + "&aw_h=" + options.height + "&aw_t=" + options.type;
  } else {
    el.src = el.src + "?avvo_widget=1&aw_w=" + options.width + "&aw_h=" + options.height + "&aw_t=" + options.type;
  }
  return el;
};
AvvoWidget.parseOptions = function(el) {
  var options = {
    width: '300',
    height: '250',
    type: "default"
  };
  var classNames = el.className.split(/\s/);
  for(var i=0; i < classNames.length; i++) {
    if(match = classNames[i].match(/size_(\d+)x(\d+)/)) {
      options.width  = match[1];
      options.height  = match[2];
    } else if(match = classNames[i].match(/avvo_wt_(.*)/)) {
      options.type = match[1];
    }
  }
  options.url = el.getElementsByTagName("a")[0].href;
  return options;
};
AvvoWidget.createWidget = function(el) {
  var options = AvvoWidget.parseOptions(el);
  var iframe = AvvoWidget.createIframe(options);
  var contentDiv = AvvoWidget.getElementsByClassName("avvo_content", null, el)[0];
  contentDiv.insertBefore(iframe, contentDiv.firstChild);
  var sib = null;
  while(sib = iframe.nextSibling) {
    contentDiv.removeChild(sib);
  }
};
AvvoWidget.init = function() {
  var widgets = AvvoWidget.getElementsByClassName("avvo_widget");
  for(var i = 0; i < widgets.length; i++) {
    AvvoWidget.createWidget(widgets[i]);
  }
  // init should only run once, even if there are multiple widgets on a page.
  AvvoWidget.init = function(){};
};
AvvoWidget.onReady(function() {
  AvvoWidget.init();
});