function Conf() { return confirm("Potvrďte odeslání zmáčknutím OK"); } 
days=new Array(31,29,31,30,31,30,31,31,30,31,30,31);

function onChangeMonth() { var oldSelected=document.formular.selDay.selectedIndex;
	document.formular.selDay.options.length=0
	var optionName; var length;
	var numOfDays=days[document.formular.selMonth.selectedIndex];
	for(i=1; i<=numOfDays; i++) { optionName = new Option(i, i, false, false);
				length=document.formular.selDay.length;
				document.formular.selDay.options[length] = optionName;
				}
	if (oldSelected>=document.formular.selDay.length)
	  oldSelected = document.formular.selDay.length-1;
	document.formular.selDay.options[oldSelected].selected = true;
}


function onChangeMonth2() { var oldSelected=document.formular.selDay2.selectedIndex;
	document.formular.selDay2.options.length=0
	var optionName; var length;
	var numOfDays=days[document.formular.selMonth2.selectedIndex];
	for(i=1; i<=numOfDays; i++) { optionName = new Option(i, i, false, false);
				length=document.formular.selDay2.length;
				document.formular.selDay2.options[length] = optionName;
				}
	if (oldSelected>=document.formular.selDay2.length)
	  oldSelected = document.formular.selDay2.length-1;
	document.formular.selDay2.options[oldSelected].selected = true;
}

function onMonth() { onChangeMonth(); onChangeMonth2(); }