function calculator() 
{
if (form.number10!=null && form.number10.selectedIndex==0)
{
form.sub.disabled=true;
form.sub.enabled=false;
document.getElementById('warning').style.display='block'
}
else
{
form.sub.disabled=false;
document.getElementById('warning').style.display='none'
}
dr = eval(form.dollar.value);
er = eval(form.euro.value);
if (form.number10==null) {
bi = document.form.number;
for (i=0; i< bi.length; i++) {
  if (bi[i].checked) {
bx = bi[i].value;
	 break;
	 }
     }
}
if (form.number10==null && bx==1) {
b1 = eval(form.basic1.value);
b = b1;
}
else if(form.number10==null && bx==2) {
b2 = eval(form.basic2.value);
b = b2;
}
else
{
b=0;
}
if(form.extra_vill!=null && form.extra_vill.checked == true && bx==1){
v1 = eval(form.extra_vil1.value);
v=v1;
}
else if(form.extra_vill!=null && form.extra_vill.checked == true && bx==2){
v2 = eval(form.extra_vil2.value);
v=v2;
}
else
{
v=0;
}
if(form.extra_irk!=null && form.extra_irk.checked == true && bx==1){
i1 = eval(form.extra_irk1.value);
ir=i1;
}
else if(form.extra_irk!=null && form.extra_irk.checked == true && bx==2){
i2 = eval(form.extra_irk2.value);
ir=i2;
}
else
{
ir=0;
}
if (form.number10!=null){
var dd = form.number10.selectedIndex;
var n10 = form.number10[dd].text;
bas = eval(form.basic1.value);
n10 = eval(n10);
if (form.number10.selectedIndex!=0){
n=bas*n10;
}
else
{
n=0;
}
}
else
{
n=0;
}
r=b+v+ir+n;
dl=r/dr;
d=(dl).toFixed(0);
el=r/er;
e=(el).toFixed(0);
if (r!=0)
{
var obj = document.getElementById('total');
obj.innerHTML = r+" "+"rub."+" "+"or"+" "+"$"+d+" "+"or"+" "+"ˆ"+e;  
}
else
{
var obj = document.getElementById('total');
obj.innerHTML = ""; 
}
}