var $el = function(id)
{
	return document.getElementById(id);
}

var $$ = function(tag)
{
	return document.getElementsByTagName(tag);
}

var cls = function(className, expected)
{
	if(typeof(className) == "undefined")
	{
		return false;
	}

	var a = className.split(" ");
	var i = 0;

	for(i = 0; i < a.length; i++)
	{
		if(expected == a[i])
		{
			return true;
		}
	}
	return false;

}

var ne = function(tag)
{
	return document.createElement(tag);
}

var tn = function(value)
{
	return document.createTextNode(value);
}

// string tables

var st = [];

var $s = function(name, value)
{
	st[st.length] = {name:name, value:value};
}

var $so = function(name)
{
	var i = 0;

	for(i = 0; i < st.length; i++)
	{
		if(st[i].name === name)
		{
			return st[i].value;
		}
	}

	return undefined;
}

if (!Array.prototype.indexOf)
{
  Array.prototype.indexOf = function(elt /*, from*/)
  {
    var len = this.length;

    var from = Number(arguments[1]) || 0;
    from = (from < 0)
         ? Math.ceil(from)
         : Math.floor(from);
    if (from < 0)
      from += len;
    for (; from < len; from++)
    {
      if (from in this &&
          this[from] === elt)
        return from;
    }
    return -1;
  };
}