if (document.all) {
    idata1=document.all('de');
    idata2=document.all('ate');
}
else if (document.getElementById) {
    idata1=document.getElementById("de");
    idata2=document.getElementById("ate");
}
window.onload= function() { 
    calendar1 = new Epoch('cal1','popup',idata1,false);
    calendar2 = new Epoch('cal2','popup',idata2,false); 
    };