function get_param(param_name)
{
    var query = location.search.substring(1);
    var pairs = query.split('&');
    for (var i = 0; i < pairs.length; i++)
    {
        var pos = pairs[i].indexOf('=');
        if (pos == -1) continue;
        var argname = pairs[i].substring(0,pos);
        if(argname.toLowerCase() == param_name.toLowerCase())
        {
            var value = pairs[i].substring(pos+1);
            value = decodeURIComponent(value);
            return value;
        }
    }
    return null;
}

function getCookie_union(name)
{
  var cookieValue = "";
  var search = name + "=";
  if(document.cookie.length > 0)
  {
    offset = document.cookie.indexOf(search);
    if (offset != -1)
    {	
      offset += search.length;
      end = document.cookie.indexOf(";", offset);
      if (end == -1) end = document.cookie.length;
      cookieValue = unescape(document.cookie.substring(offset, end))
    }
  }
  return cookieValue;
}

function setCookie_union(cookieName,cookieValue,DayValue)
{
    var expire = "";
    var day_value=1;
    if(DayValue!=null)
    {
	    day_value=DayValue;
    }
    expire = new Date((new Date()).getTime() + day_value * 86400000);
    expire = "; expires=" + expire.toGMTString();
    document.cookie = cookieName + "=" + escape(cookieValue) +";domain=vancl.com;path=/"+ expire;
}

function get_counter_url()
{
    var source = get_param('source');
    if (source!=null)
    {
        var visited = getCookie_union('union_visited');
        var isnew;
        if(visited == '1')
        {
            isnew = 0;
        }
        else
        {
            setCookie_union('union_visited', '1', 1);
            isnew = 1;
        }
        
        var counter_url = 'http://click.vancl.com/webclick/counter<%=tools.site_html%>?p1=' + source + '&p2=' + escape(location.href) + '&p3=' + isnew + '&p4=' + escape(document.referrer);
        return counter_url;
    }
}