var roz = new Date().getTime()-(1257614152*1000);
function zegar(){
D = new Date();
D.setTime(D.getTime()-roz);
G = D.getHours();
M = D.getMinutes(); M=M<10?'0'+M:M;
S = D.getSeconds(); S=S<10?'0'+S:S;
document.getElementById('czas').innerHTML=' '+ G + ':' + M;
setTimeout('zegar()', 1000);
}