function calc_student() {
	
	priceAPerson = 0;
	totalPrice = 0;
	people = 0;
	period = 0;
	bilingual = false;
	
	
	if ((document.student_reg.Level.selectedIndex > 0) && (document.student_reg.Level.selectedIndex < 7)){ 
		if (document.student_reg.People.selectedIndex == 1){
			people = 1;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 200;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 250;
		}
		if (document.student_reg.People.selectedIndex == 2){
			people = 2;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 180;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 225;
		}
		if (document.student_reg.People.selectedIndex == 3){
			people = 3;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 165;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 200;
		}
		if (document.student_reg.People.selectedIndex == 4){
			people = 4;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 150;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 175;
		}
	}
		
	if ((document.student_reg.Level.selectedIndex > 7) && (document.student_reg.Level.selectedIndex < 12)){
		if (document.student_reg.People.selectedIndex == 1){
			people = 1;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 250;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 300;
		}
		if (document.student_reg.People.selectedIndex == 2){
			people = 2;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 225;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 275;
		}
		if (document.student_reg.People.selectedIndex == 3){
			people = 3;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 200;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 250;
		}
		if (document.student_reg.People.selectedIndex == 4){
			people = 4;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 175;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 125;
		}
	}

	if ((document.student_reg.Level.selectedIndex > 12) && (document.student_reg.Level.selectedIndex < 19)){
		if (document.student_reg.People.selectedIndex == 1){
			people = 1;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 300;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 350;
		}
		if (document.student_reg.People.selectedIndex == 2){
			people = 2;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 275;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 325;
		}
		if (document.student_reg.People.selectedIndex == 3){
			people = 3;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 250;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 300;
		}
		if (document.student_reg.People.selectedIndex == 4){
			people = 4;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 225;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 275;
		}
	}

	if (document.student_reg.Level.selectedIndex > 19){
		if (document.student_reg.People.selectedIndex == 1){
			people = 1;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 350;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 400;
		}
		if (document.student_reg.People.selectedIndex == 2){
			people = 2;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 325;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 375;
		}
		if (document.student_reg.People.selectedIndex == 3){
			people = 3;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 300;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 350;
		}
		if (document.student_reg.People.selectedIndex == 4){
			people = 4;
			if (document.student_reg.Bilingual_N.checked == true ) priceAPerson = 275;
			if (document.student_reg.Bilingual_Y.checked == true ) priceAPerson = 325;
		}
	}

	switch (document.student_reg.numHour.selectedIndex){
		case 0:totalPrice = priceAPerson*people*2;	period = 2;	break;
		case 1:totalPrice = priceAPerson*people*3;	period = 3;	break;
		case 2:totalPrice = priceAPerson*people*4;	period = 4;	break;
		case 3:totalPrice = priceAPerson*people*5;	period = 5;	break;
	}

	
	document.student_reg.priceAPerson.value = priceAPerson;
	document.student_reg.period.value = period;
	document.student_reg.people.value = people;
	document.student_reg.totalPrice.value = totalPrice;
}