function calculate()
{

// if  (document.calcform.course[0].selected) {
// document.calcform.courseprice.value = 123;
// }
// 
// if  (document.calcform.course[1].selected) {
// document.calcform.courseprice.value = 222;
// }
var minweeks = 1; //default
var maxweeks = 48; //default

var enrolfee= 100; //from db


//get accomm price
var my_price=document.calcform.accomm.options[document.calcform.accomm.selectedIndex].value;
var my_price_array=my_price.split("_");
document.calcform.accommprice.value = my_price_array[1];
document.calcform.accommtype.value = my_price_array[0];



//get course details
var course_details=document.calcform.course.options[document.calcform.course.selectedIndex].value;
var course_details_array= course_details.split("_");
document.calcform.coursename.value = course_details_array[0]; 
document.calcform.courseprice.value = course_details_array[1];


if (course_details_array[2] !=""){
var minweeks = course_details_array[2];
}

if (course_details_array[3] !=""){
var maxweeks = course_details_array[3];
}


//var maxweeks = course_details_array[3];



//max courseweeks 
   if (document.calcform.courseweeks.value > maxweeks*1){
document.calcform.courseweeks.value = maxweeks;
}

//min courseweeks from db
   if (document.calcform.courseweeks.value < minweeks*1){
document.calcform.courseweeks.value = minweeks;
}

//enrolment fee
if (document.calcform.courseweeks.value > 0 )
{document.calcform.efee.value = enrolfee}
else
{document.calcform.efee.value = 0}



//accomweeks same as courseweeks
document.calcform.accommweeks.value  = document.calcform.courseweeks.value 



// calc total
document.calcform.coursetotal.value = (document.calcform.courseprice.value)*(document.calcform.courseweeks.value)


document.calcform.accommtotal.value = (document.calcform.accommprice.value)*(document.calcform.accommweeks.value)


//document.calcform.accommtotal.value = (document.calcform.accommprice.value)*(document.calcform. courseweeks.value)


document.calcform.total.value = eval(document.calcform.coursetotal.value) + eval(document.calcform.efee.value)+ eval(document.calcform.accommtotal.value)

}