function selectAllOptions(selObj)
{
  for (var i=0; i<selObj.options.length; i++) {
    selObj.options[i].selected = true;
  }
}

function addOption(theSel, theText, theValue)
{
  var newOpt = new Option(theText, theValue);
  var selLength = theSel.length;
  theSel.options[selLength] = newOpt;
}

function deleteOption(theSel, theIndex)
{ 
  var selLength = theSel.length;
  if(selLength>0)
  {
    theSel.options[theIndex] = null;
  }
}

function moveOptions(theSelFrom, theSelTo)
{
  var selLength = theSelFrom.length;
  var selectedText = new Array();
  var selectedValues = new Array();
  var selectedCount = 0;
  
  var i;
  
  // Find the selected Options in reverse order
  // and delete them from the 'from' Select.
  for(i=selLength-1; i>=0; i--)
  {
    if(theSelFrom.options[i].selected)
    {
      selectedText[selectedCount] = theSelFrom.options[i].text;
      selectedValues[selectedCount] = theSelFrom.options[i].value;
      deleteOption(theSelFrom, i);
      selectedCount++;
    }
  }
  
  // Add the selected text/values in reverse order.
  // This will add the Options to the 'to' Select
  // in the same order as they were in the 'from' Select.
  for(i=selectedCount-1; i>=0; i--)
  {
    addOption(theSelTo, selectedText[i], selectedValues[i]);
  }
}

function CasellaMarcada(obj) {
	// Cal avaluar tres casos en funció de si la taula té 0, 1 o més files

	// Si no hi ha cap fila a la taula no cal avaluar res
	if (!obj)
		return false;

	// Si només hi ha una fila...
	if (obj.length == undefined)
		if (obj.checked) 
			return true;
		else
			return false;
 
	// Si hi ha més d'una fila...
	for (i = 0; i < obj.length; i++)
		if (obj[i].checked) return true;
	return false;
}

function ToggleObject(obj) {
	var el = document.getElementById(obj);
	el.style.display = (el.style.display != 'none' ? 'none' : '' );
}