function calculate() {
 	var doc = document.pointCalc;
 	var points = 0;
 	var outstorebaht = doc.outstorebaht.value;
	var rewardpercent = doc.rewardpercent.value;

 	points = (outstorebaht / 100 * rewardpercent);
 	doc.result.value = Math.round(points);
}