function clean() {
 document.form1.txtAgeYears.value=""
 document.form1.txtAgeMonths.value=""
 document.form1.txtService.value=""
 document.form1.txtSalary.value=""
 document.form1.txtStatutory.value=""
}

function refresh() {
  document.form1.txtStatutory.value=""
}

function calculate() {

 ageYears=document.form1.txtAgeYears.value
 ageMonths=document.form1.txtAgeMonths.value
 service=document.form1.txtService.value

 if (service>20) {
  service=20
 }

 ageStart=ageYears-service
 salary=document.form1.txtSalary.value
 maxWage=380

 weekWage=salary/52

 if (weekWage>maxWage) {
  weekWage=maxWage
 }

 weeks=0

 for (age=ageStart; age<ageYears; age++) {

  if (age<22 && service>=2) {
   weeks=weeks+0.5
  }

  if (age>21 && age<41 && service>=2) {
   weeks=weeks+1
  }

  if (age>40 && service>=2) {
   weeks=weeks+1.5
  }

 }

 statutory=weeks*weekWage


 document.form1.txtStatutory.value=statutory

}