function change(id)
{
  clearAll();
  
  var myImg=[];
        myImg[0]=new Image(26, 28);
        myImg[0].src="img/form_unchecked.gif";
        myImg[1]=new Image(26, 28);
        myImg[1].src="img/form_checked.gif";
        
        
  var oCheckBox = document.getElementById('checkbox'+id);
  var oIsChecked = document.getElementById('ischecked'+id);
    
  if(oCheckBox.src == myImg[0].src) {
      oCheckBox.src = myImg[1].src;
      oIsChecked.value = "true";
      
   }
  /*else {
      oCheckBox.src = myImg[0].src;
      oIsChecked.value = "false";
  }*/
}

function clearAll() 
{
  var inputs = document.sonda.getElementsByTagName('input');
	for(i = 0; i < inputs.length; i++) {
    if(inputs[i].value == "true")
      inputs[i].value = "false";
  }
  var imgs = document.sonda.getElementsByTagName('img');
  for(i = 0; i < imgs.length; i++) {
    var src = imgs[i].src;
    if(src.match("img/form_checked.gif"))
      imgs[i].src = "img/form_unchecked.gif"
  }
}