function obr(){
popup=window.open('rek.html','','toolbar=yes,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no, fullscreen=no,channelmode=no,width=600,height=850,top=100,left=100');

}

function but()

{

 document.getElementById('but').style.display='block';

 document.getElementById('lin').style.display='none';

}

function lin()

{

 document.getElementById('but').style.display='none';

 document.getElementById('lin').style.display='block';

}


function pokaz_transmisje (dzien)
{

document.getElementById('tra_pon').style.display = "none";
document.getElementById('tra_wto').style.display = "none";
document.getElementById('tra_sro').style.display = "none";
document.getElementById('tra_czw').style.display = "none";
document.getElementById('tra_pia').style.display = "none";
document.getElementById('tra_sob').style.display = "none";
document.getElementById('tra_nie').style.display = "none";
document.getElementById('tra_' + dzien).style.display = "block";



document.getElementById('text_pon').style.fontWeight = "normal";
document.getElementById('text_wto').style.fontWeight = "normal";
document.getElementById('text_sro').style.fontWeight = "normal";
document.getElementById('text_czw').style.fontWeight = "normal";
document.getElementById('text_pia').style.fontWeight = "normal";
document.getElementById('text_sob').style.fontWeight = "normal";
document.getElementById('text_nie').style.fontWeight = "normal";

document.getElementById('text_' + dzien).style.fontWeight = "bold";



}


function pokaz_menu(id)
{

document.getElementById('pod_m_1').style.display = "none";
document.getElementById('pod_m_2').style.display = "none";
document.getElementById('pod_m_3').style.display = "none";
document.getElementById('pod_m_4').style.display = "none";


document.getElementById('pod_m_' + id).style.display = "block";
}

<!-- Hide it
// Returns today's date in a string with full day and month names
// by Roger C. Scudder Jr. on 10-2-98
// corrected for Netscape by Grzegorz Golebiewski
DayName = new Array(7)
DayName[0] = "niedziela "
DayName[1] = "poniedzia&#322ek "
DayName[2] = "wtorek "
DayName[3] = "&#347roda "
DayName[4] = "czwartek "
DayName[5] = "pi&#261tek "
DayName[6] = "sobota "

MonthName = new Array(12)
MonthName[0] = "stycznia "
MonthName[1] = "lutego "
MonthName[2] = "marca "
MonthName[3] = "kwietnia "
MonthName[4] = "maja "
MonthName[5] = "czerwca "
MonthName[6] = "lipca "
MonthName[7] = "sierpnia "
MonthName[8] = "wrze&#347nia "
MonthName[9] = "pa&#378dziernika "
MonthName[10] = "listopada "
MonthName[11] = "grudnia "

function getDateStr(){
var Today = new Date()
var WeekDay = Today.getDay()
var Month = Today.getMonth()
var Day = Today.getDate()
var Year = Today.getFullYear()


return DayName[WeekDay] + "," + " <b>" + Day + "</b> " + MonthName[Month] + ", " + Year
}