function set_cookie ( name, value, exp_y, exp_m, exp_d, path, domain, secure )
{
  var cookie_string = name + "=" + escape ( value );
  if ( exp_y ) {
    var expires = new Date ( exp_y, exp_m, exp_d );
    cookie_string += "; expires=" + expires.toGMTString();
  }
  if ( path ) { cookie_string += "; path=" + escape ( path ); }
  if ( domain ) { cookie_string += "; domain=" + escape ( domain ); }
  if ( secure ) { cookie_string += "; secure"; }
  document.cookie = cookie_string;
}
function galcon_store_offset() {
    var offset = new Date().getTimezoneOffset();
    var dt = new Date();
    set_cookie("gc_offset",offset,
        dt.getFullYear()+1,dt.getMonth(),dt.getDay(),
        "/",false,false);
}
galcon_store_offset();