var jetzt = new Date();
 var tz_offset = jetzt.getTimezoneOffset() / 60;
 
 
 
 if(session_id){
    $.get("/ajax/timezone_set.php", { session_id: ""+session_id+"",tz_offset: tz_offset },  function(data){});
 }else{
    $("form[name=login_form]").ready(function(){
	$("form[name=login_form]").append("<input type='hidden' name='tz_offset' value='"+tz_offset+"'/>");
    });
 }