function calculate_procent(form, listpris, valuta) {
get = 'pris_'+valuta;

a = form.elements[get].value;
target = 'marginal_'+valuta;

d = (1-(listpris/a))*100;

form.elements[target].value = d;
}


function calculate_pris(form, listpris, valuta) {
	
get = 'marginal_'+valuta;
target = 'pris_'+valuta;

a = form.elements[get].value/100;
b = listpris/(1-a);

form.elements[target].value = b;
}



function calculate_new_pris(form, valuta, kurs) {
	
get = 'pris_SEK';

a = (form.elements[get].value*kurs)/10;

target = 'pris_'+valuta;

form.elements[target].value = a;
}