// JavaScript Document

var style_cookie_name = "style" ;
var style_cookie_duration = 30 ;

function switch_style ( css_title )
{
  var i, link_tag ;
  for (i = 0, link_tag = document.getElementsByTagName("link") ;
    i < link_tag.length ; i++ ) {
    if ((link_tag[i].rel.indexOf( "stylesheet" ) != -1) &&
      link_tag[i].title) {
      link_tag[i].disabled = true ;
      if (link_tag[i].title == css_title) {
        link_tag[i].disabled = false ;
      }
    }
    set_cookie( style_cookie_name, css_title, style_cookie_duration );
  }
}

function set_style_from_cookie()
{
  var css_title = get_cookie( style_cookie_name );
  
  //alert (css_title);
  
  if (css_title.length) 
  {
  switch_style( css_title );
  }
  
}

function set_cookie ( cookie_name, cookie_value,lifespan_in_days, valid_domain )
{
    var domain_string = valid_domain ?
                       ("; domain=" + valid_domain) : '' ;
    document.cookie = cookie_name +
                       "=" + encodeURIComponent( cookie_value ) + "; max-age=" + 60 * 60 *
                       24 * lifespan_in_days +
                       "; path=/" + domain_string ;
}


function get_cookie(cookie_name)
{
c_name = cookie_name;
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=");
  if (c_start!=-1)
    {
    c_start=c_start + c_name.length+1;
    c_end=document.cookie.indexOf(";",c_start);
    if (c_end==-1) c_end=document.cookie.length;
    return unescape(document.cookie.substring(c_start,c_end));
    }
  }
return "";
}