var elementmaxheight = function() {
  this.initialize.apply(this, arguments);
}

elementmaxheight.prototype = {
  initialize: function(classname) {
    this.elements = document.getelementsbyclassname(classname || 'maxheight');    
    this.textelement = document.createelement('span');
    this.textelement.appendchild(document.createtextnode('a'));
    this.textelement.style.display = 'block';
    this.textelement.style.position = 'absolute';
    this.textelement.style.fontsize = '1em';
    this.textelement.style.top = '-1000px';
    this.textelement.style.left = '-1000px';
    document.body.appendchild(this.textelement);
    this.textelementheight = document.getdimensions(this.textelement).height;
    var __object = this;
    var __checkfontsize = this.checkfontsize;
    this.checkfontsizeinterval = window.setinterval(function() {return __checkfontsize.apply(__object)}, 500);

    this.expand();

    // refresh elements height onresize event
    var __expand = this.expand;
    if (window.addeventlistener) {
      window.addeventlistener('resize', function(event) {return __expand.apply(__object, [( event || window.event)])}, false);
    } else if (window.attachevent) {
      window.attachevent('onresize', function(event) {return __expand.apply(__object, [( event || window.event)])});
    }
  },

  expand: function() {
    this.reset();
  	for (var i = 0; i < this.elements.length; i++) {  	
      this.elements[i].style.height = document.getdimensions(this.elements[i].parentnode).height + 'px';
  	}
  },

  reset: function() {
    for (var i = 0; i < this.elements.length; i++) {    
      this.elements[i].style.height = 'auto';
    }
  },

  checkfontsize: function() {
  	var height = document.getdimensions(this.textelement).height;
  	if(this.textelementheight != height) {
  		this.textelementheight = height;
  		this.expand();
  	}
  }  
}


if (!!document.evaluate) {
  document._getelementsbyxpath = function(expression, parentelement) {
    var results = [];
    var query = document.evaluate(expression, parentelement || document,
      null, xpathresult.ordered_node_snapshot_type, null);
    for (var i = 0, length = query.snapshotlength; i < length; i++)
      results.push(query.snapshotitem(i));
    return results;
  }
}

document.getelementsbyclassname = function(classname, parentelement) {
  if (!!document.evaluate) {
    var q = ".//*[contains(concat(' ', @class, ' '), ' " + classname + " ')]";
    return document._getelementsbyxpath(q, parentelement);
  } else {
    var children = (parentelement || document.body).getelementsbytagname('*');
    var elements = [], child;
    for (var i = 0, length = children.length; i < length; i++) {
      child = children[i];
      if (child.classname.length != 0 &&
          (child.classname == classname ||
           child.classname.match(new regexp("(^|\\s)" + classname + "(\\s|$)")))) {      
        elements.push(child);
      }
    }
    return elements;
  }
}

document.getdimensions = function (element) {
  var display = element.style.display;
  if (display != 'none' && display != null) { // safari bug
    return {width: element.offsetwidth, height: element.offsetheight};
  }

  return {width: originalwidth, height: originalheight};
}