function check(form){
	if(document.form.kvalitet.value=="Izaberi"){
		alert("Izaberite kvalitet!");
	} else if(document.form.slots.value=="Izaberi"){
		alert("Izaberite broj slusalaca!");
	} else if(document.form.slots.value=="Choose"){
		alert("Please, select number of listeners!");
	} else if(document.form.kvalitet.value=="Choose"){
		alert("Please, select quality value!");
	} else {
		form.submit();
	}
}

function update(){
	var mes = 0.0;
	if(document.form.vrem.value=="1 Mesec" || document.form.vrem.value=="1 Month"){
		mes = 1.0;
	} else if(document.form.vrem.value=="2 Meseca" || document.form.vrem.value=="2 Month"){
		mes = 2.0;
	} else if(document.form.vrem.value=="3 Meseca" || document.form.vrem.value=="3 Months"){
		mes = 3.0;
	} else if(document.form.vrem.value=="6 Meseci" || document.form.vrem.value=="6 Months"){
		mes = 6.0;
	} else if(document.form.vrem.value=="12 Meseci" || document.form.vrem.value=="12 Months"){
		mes = 12.0;
	}
	if(document.form.kvalitet.value=="32 kbit/sec" && document.form.slots.value=="30"){
		document.form.cena.value = 3.50*mes;
	} else if(document.form.kvalitet.value=="32 kbit/sec" && document.form.slots.value=="50"){
		document.form.cena.value = 4.90*mes;
	} else if(document.form.kvalitet.value=="32 kbit/sec" && document.form.slots.value=="75"){
		document.form.cena.value = 7.10*mes;
	} else if(document.form.kvalitet.value=="32 kbit/sec" && document.form.slots.value=="100"){
		document.form.cena.value = 9.40*mes;
	} else if(document.form.kvalitet.value=="32 kbit/sec" && document.form.slots.value=="150"){
		document.form.cena.value = 14.00*mes;
	} else if(document.form.kvalitet.value=="32 kbit/sec" && document.form.slots.value=="200"){
		document.form.cena.value = 18.50*mes;
	} else if(document.form.kvalitet.value=="32 kbit/sec" && document.form.slots.value=="300"){
		document.form.cena.value = 28.00*mes;
	} else if(document.form.kvalitet.value=="48 kbit/sec" && document.form.slots.value=="30"){
		document.form.cena.value = 6.80*mes;
	} else if(document.form.kvalitet.value=="48 kbit/sec" && document.form.slots.value=="50"){
		document.form.cena.value = 7.30*mes;
	} else if(document.form.kvalitet.value=="48 kbit/sec" && document.form.slots.value=="75"){
		document.form.cena.value = 10.00*mes;
	} else if(document.form.kvalitet.value=="48 kbit/sec" && document.form.slots.value=="100"){
		document.form.cena.value = 13.90*mes;
	} else if(document.form.kvalitet.value=="48 kbit/sec" && document.form.slots.value=="150"){
		document.form.cena.value = 20.00*mes;
	} else if(document.form.kvalitet.value=="48 kbit/sec" && document.form.slots.value=="200"){
		document.form.cena.value = 27.00*mes;
	} else if(document.form.kvalitet.value=="48 kbit/sec" && document.form.slots.value=="300"){
		document.form.cena.value = 40.00*mes;
	} else if(document.form.kvalitet.value=="64 kbit/sec" && document.form.slots.value=="30"){
		document.form.cena.value = 6.90*mes;
	} else if(document.form.kvalitet.value=="64 kbit/sec" && document.form.slots.value=="50"){
		document.form.cena.value = 9.80*mes;
	} else if(document.form.kvalitet.value=="64 kbit/sec" && document.form.slots.value=="75"){
		document.form.cena.value = 14.60*mes;
	} else if(document.form.kvalitet.value=="64 kbit/sec" && document.form.slots.value=="100"){
		document.form.cena.value = 19.60*mes;
	} else if(document.form.kvalitet.value=="64 kbit/sec" && document.form.slots.value=="150"){
		document.form.cena.value = 29.00*mes;
	} else if(document.form.kvalitet.value=="64 kbit/sec" && document.form.slots.value=="200"){
		document.form.cena.value = 38.00*mes;
	} else if(document.form.kvalitet.value=="64 kbit/sec" && document.form.slots.value=="300"){
		document.form.cena.value = 55.30*mes;
	} else if(document.form.kvalitet.value=="128 kbit/sec" && document.form.slots.value=="30"){
		document.form.cena.value = 12.50*mes;
	} else if(document.form.kvalitet.value=="128 kbit/sec" && document.form.slots.value=="50"){
		document.form.cena.value = 19.80*mes;
	} else if(document.form.kvalitet.value=="128 kbit/sec" && document.form.slots.value=="75"){
		document.form.cena.value = 28.00*mes;
	} else if(document.form.kvalitet.value=="128 kbit/sec" && document.form.slots.value=="100"){
		document.form.cena.value = 38.00*mes;
	} else if(document.form.kvalitet.value=="128 kbit/sec" && document.form.slots.value=="150"){
		document.form.cena.value = 57.00*mes;
	} else if(document.form.kvalitet.value=="128 kbit/sec" && document.form.slots.value=="200"){
		document.form.cena.value = 75.00*mes;
	} else if(document.form.kvalitet.value=="128 kbit/sec" && document.form.slots.value=="300"){
		document.form.cena.value = 110.50*mes;
	} else {
		document.form.cena.value = 0.00;
	}
}