// JavaScript Document
function checkSubmit()
{
  if(document.getElementById('agreement').checked)
  {
  document.getElementById('confirmButton').disabled='';
  }
  else
  {
  document.getElementById('confirmButton').disabled='disabled';
  }
}

function doCount(activator,element1,element2,ratio)
{
  a = document.getElementById(element1);
  b = document.getElementById(element2);
  
  if(activator=='vyska')
  {
  // budu nastavovat sirku
  a.value = ratio*b.value;
  a.value = Math.round(a.value);
  }
  if(activator='sirka')
  {
  // Budu nastavovat vysku
  b.value = a.value/ratio;
  b.value = Math.round(b.value);
  }  

}