// калькулятор цены

function calc_price(f, theme) {

minutes = f.minutes.value;

switch(theme)
	{
	case 'audio' :
		if (minutes < 30) minutes = 30;
		if (minutes < 120) price = 8;
		else if (minutes < 300) price = 7;
		else if (minutes < 600) price = 6;
		else if (minutes < 1200) price = 5;
		else price = 4;
		break;

	case 'vinil' :
		if (minutes < 30) minutes = 30;
		if (minutes < 120) price = 10;
		else if (minutes < 300) price = 8;
		else if (minutes < 600) price = 7;
		else if (minutes < 1200) price = 6;
		else price = 5;
		break;

	case 'video' :
		if (minutes < 30) minutes = 30;
		if (minutes < 120) price = 10;
		else if (minutes < 300) price = 8;
		else if (minutes < 600) price = 7;
		else if (minutes < 1200) price = 6;
		else price = 5;
		break;

	case 'roll':
		if (minutes < 30) minutes = 30;
		if (minutes < 120) price = 12;
		else if (minutes < 300) price = 10;
		else if (minutes < 600) price = 9;
		else if (minutes < 1200) price = 8;
		else price = 7;
		break;
		
	case 'betacam' :
		if (minutes < 30) minutes = 30;
		if (minutes < 120) price = 14;
		else if (minutes < 300) price = 12;
		else if (minutes < 600) price = 10;
		else if (minutes < 1200) price = 9;
		else price = 8;
		break;

	case 'dvcam' :
		if (minutes < 30) minutes = 30;
		if (minutes < 120) price = 12;
		else if (minutes < 300) price = 10;
		else if (minutes < 600) price = 8;
		else if (minutes < 1200) price = 7;
		else price = 6;
		break;

	case 'plenka8' :
		if (minutes < 10) minutes = 10;
		if (minutes < 120) price = 60;
		else if (minutes < 300) price = 57;
		else if (minutes < 600) price = 55;
		else if (minutes < 1200) price = 53;
		else price = 52;
		break;

	case 'plenka8a' :
		if (minutes < 10) minutes = 10;
		if (minutes < 120) price = 80;
		else if (minutes < 300) price = 77;
		else if (minutes < 600) price = 75;
		else if (minutes < 1200) price = 73;
		else price = 72;
		break;

	case 'plenka16' :
		if (minutes < 5) minutes = 5;
		if (minutes < 120) price = 100;
		else if (minutes < 300) price = 90;
		else if (minutes < 600) price = 80;
		else if (minutes < 1200) price = 75;
		else price = 73;
		break;

	case 'plenka16a' :
		if (minutes < 5) minutes = 5;
		if (minutes < 120) price = 120;
		else if (minutes < 300) price = 110;
		else if (minutes < 600) price = 100;
		else if (minutes < 1200) price = 95;
		else price = 93;
		break;
		
	default:
		price = 0;
	}

f.price.value = price;
f.sum.value = minutes * price;

}