function checkSubmitButton()
{
  var eventSelect     = document.forms.giftsearch.event;
  var receiverSelect  = document.forms.giftsearch.receiver;
  var priceSelect     = document.forms.giftsearch.price;
  var chosen          = 0;
  if( '' != eventSelect.value ) chosen += 1;
  if( '' != receiverSelect.value ) chosen += 1;
  if( '' != priceSelect.value ) chosen += 1;
  var button    = document.getElementById( 'submitButton' );
  if( button )
  {
    if( 1 <= chosen ) button.disabled    = false;
    else button.disabled    = true;
  }
}
function switchStyle( elem )
{
  if( elem )
  {
    activeClass   = elem.getAttribute( 'class' );
    if( 'formfull' == activeClass )
    {
      elem.setAttribute( 'class', 'formactive' );
    }
    else
    {
      elem.setAttribute( 'class', 'formfull' );
    }
  }
}