function cal_info(calyr, calmn, caldy, calitem) {
	var finyr;
    var stryr;
    var strmn;
    var strdy;
    var stritem;
    var strFile;
	if (arguments.length == 3) {
		var calitem = 1;
	}
	if (calmn < 7 ) {
        finyr = String( calyr - 1 ) + '-' + String( calyr ).substr( 2, 2 );
    }
    else {
        finyr = String( calyr ) + '-' + String( calyr + 1 ).substr( 2, 2 );
    } 
    stryr = String( calyr );
    strmn = '0' + String( calmn );
    strmn = strmn.substr( strmn.length - 2, 2 );
    strdy = '0' + String( caldy );
    strdy = strdy.substr( strdy.length - 2, 2 );
    stritem = '0' + String( calitem );
    stritem = stritem.substr( stritem.length - 2, 2 );
	strFile = '/calendar/' + finyr + '/' + stryr.substr( 2, 2 ) + strmn + strdy + stritem + '.htm';
	mywindow = window.open(
		strFile,
		'margin', 'toolbar=no,location=no,directories=no,menubar=no,scrollbars=yes,status=no,resizable=yes,width=400,height=300'
	)
}