function mySet(){
myBirth = new Date( document.myForm.myFormY.value ,document.myForm.myFormM.value - 1 ,document.myForm.myFormD.value );
myBack= new Date( document.myForm.myBackY.value ,document.myForm.myBackM.value - 1 ,document.myForm.myBackD.value );
myMsec = myBack.getTime()-myBirth.getTime();
myDay = Math.floor(myMsec / (1000*60*60*24));
document.myForm.myFormMes.value
 = "先生のご出張日数は" + (myDay+1) + "日間です。";
}
function calcMD(n)
{
	y = eval(document.myForm2.y.value);
	m = eval(document.myForm2.m.value);
	d = eval(document.myForm2.d.value);
	n     = eval(document.myForm2.days.value);
	nmsec = n * 1000 * 60 * 60 * 24;	//　１日のミリ秒
	msec  = (new Date(""+y+"/"+m+"/"+d)).getTime();
	dt    = new Date(msec + nmsec - 1 );
	year = dt.getYear();
	month = dt.getMonth() + 1;
	date  = dt.getDate();
	document.myForm2.myFormMes.value = (y+"年"+m+"月"+d+"日を出発日として、出張期間"+n+"日間の帰国日は"+year+"年"+month+"月"+date+"日です。");
}