function wejscie() {
document.getElementById('loadingstrona').style.display='none';
var r= +screen.height;
document.getElementById('strona').style.minHeight=r+"px";
for (var i=0; i<=100; i++){
setTimeout("alpha('"+i+"');", i*50);
}
}
function alpha(krok) {
document.getElementById('strona').style.filter='Alpha(Opacity='+krok+')'; 
document.getElementById('strona').style.opacity=(krok/100);
}