function addLoadEvent(func) 
{
  var oldonload = window.onload;
  
  if (typeof window.onload != 'function') 
  {
    window.onload = func;
	}
	else
	{
    window.onload = function() 
    {
      if (oldonload) { oldonload(); }
      func();
    };
  }
}

function setCookie(name, value, days)
{
  if (days) 
  {
    var date = new Date();
    date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
    var expires = '; expires=' + date.toGMTString();
  } else { var expires = ''; }  
	document.cookie = name + '=' + value + expires + '; path=/';
}

function getCookie(name)
{
	name = name + '=';
	list = document.cookie.split(';');
	for (i = 0; i < list.length; i++)
	{
		c = list[i];
		while (c.charAt(0) == ' ') c = c.substring (1, c.length);
		if (c.indexOf(name) == 0) return c.substring(name.length, c.length);
	}
	return false;
}

function byID(id) 
{
	return document.getElementById(id);
}

function show(id) 
{
	byID(id).style.display = '';
}

function hide(id) 
{
	byID(id).style.display = 'none';
}

function enable(id) 
{
	byID(id).disabled = false;
}

function disable(id) 
{
	byID(id).disabled = true;
}