function calculateTax()
{
	var output = 0;
	var cha = $("revenue").value - $("startline").value;
	if (cha<=0) {output=0;}
	if (cha>0&&cha<=500) {output=cha*0.05;}
	if (cha>500&&cha<=2000) {output=cha*0.1-25;}
	if (cha>2000&&cha<=5000) {output=cha*0.15-125;}
	if (cha>5000&&cha<=20000) {output=cha*0.2-375;}
	if (cha>20000&&cha<=40000) {output=cha*0.25-1375;}
	if (cha>40000&&cha<=60000) {output=cha*0.30-3375;}
	if (cha>60000&&cha<=80000) {output=cha*0.35-6375;}
	if (cha>80000&&cha<=100000) {output=cha*0.4-10375;}
	if (cha>100000&&cha>100000) {output=cha*0.45-15375;}
	$("tax").innerHTML = "您应缴个人所得税额："+output+"元<br>依法纳税是每个公民应尽的义务！！";
}