function calcsdr(form){

var sdr=eval((0.228+0.1239)*form.eurusd.value);
var sdr=eval(sdr + (27.2/form.usdjpy.value));
var sdr=eval(sdr + 0.5821 + (0.105*form.gbpusd.value));

var sdr=eval(Math.round(sdr*100000,5)/100000);

form.sdr.value=sdr;
}