// CSS Classes

var hasClassName = function(element, className) {
  var elementClassName = element.className;
  return (elementClassName.length > 0 && (elementClassName == className ||
    new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
};

var addClassName = function(element, className) {
  if (!hasClassName(element, className))
    element.className += (element.className ? ' ' : '') + className;
  return element;
};

var removeClassName = function(element, className) {
  element.className = element.className.replace(
    new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ');
  return element;
};

if(!document.getElementsByClassName){
  document.getElementsByClassName = function(className) {
    var docList = this.all || this.getElementsByTagName('*');
    var matchArray = new Array();
    /*Create a regular expression object for class*/
    var re = new RegExp("(?:^|\\s)"+className+"(?:\\s|$)");
    for (var i = 0; i < docList.length; i++) {
        if (re.test(docList[i].className) ) {
            matchArray[matchArray.length] = docList[i];
        }
    }
    return matchArray;
  };
}

// Events

var dispatchEvent = function(obj, type, bubble, canCancel){
  if(bubble == undefined){
    bubble = true;
  }
  if(canCancel == undefined){
    canCancel = true;
  }
  if(document.createEvent){
    var e = document.createEvent('HTMLEvents');
    if(e.initEvent){
      e.initEvent(type, bubble, canCancel);
    }
    if(obj.dispatchEvent){
      obj.dispatchEvent(e);
    }
  } else if(obj.fireEvent){
    obj.fireEvent('on'+type);
  }
};

var bindEvent = function(el, event, callback){
  if ( document.addEventListener ) {
    el.addEventListener(event, callback, false );
  } else if ( document.attachEvent ) {
    el.attachEvent( "on"+event, callback );
  }
}

// Animation

var setOpacity = function(e, obj, value){
  obj.style.opacity = value/100;
  obj.style.filter = 'alpha(opacity=' + value + ')';
};

var fadeIn = function(obj, level, speed, callback){
  if (level === undefined) var level = 100;
  if (speed === undefined) var speed = 70;
  if (!speed)
  {
    setOpacity(null, obj, level*10);
    if (callback) callback();
    return;
  }
  setOpacity(null, obj, 0);
  for (var i=0; i<=level; i++){
    setTimeout(bind(setOpacity, obj, i*10), speed*i);
  }
  if (callback) setTimeout(callback, speed*(i+1));
};

// Basic Functional

var lower = function(obj){
  return obj.toString().toLowerCase();
};
var collect = function(list,func){
  var x = [];
  for(var i=0; i<list.length; i++){
    if(func(list[i])){
      x.push(list[i]);
    }
  }
  return x;
}
var each = function(list,func){
  var x = [];
  for(var i=0; i<list.length; i++){
    x.push(func(list[i]));
  }
  return x;
}
var first = function(list,func){
  var x;
  for(var i=0; i<list.length; i++){
    x = func(list[i]);
    if(x){
      return list[i];
    }
  }
}
var merge = function(a,b){
  obj = {};
  for(prop in a){
    obj[prop] = a[prop];
  }
  for(prop in b){
    obj[prop] = b[prop];
  }
  return obj;
}