function checkSetb()
	{
		var pnum = document.form.people.value
		var ss = document.form.submitSet_x.value
		if (pnum<80){
			alert("人數只少要有80人")
		}else{
			if (pnum%20 == 0){
				if (ss)
				alert("submitSetisOK")
				document.form.submit();
			}else{
				alert("人數要20的倍數")
			}
		}
	}