function wejscie() {
document.getElementById('tresc').style.display='';
document.getElementById('loading').style.display='none';

//document.getElementById('tresc').style.filter='Alpha(100)'; 
//document.getElementById('tresc').style.opacity=(1);

//for (var i=0; i<=100; i++){
//setTimeout("alpha('"+i+"');", i*50);
//}
}
function alpha(krok) {
 document.getElementById('tresc').style.filter='Alpha(Opacity='+krok+')'; 
document.getElementById('tresc').style.opacity=(krok/100);
}