window.onerror=null;



/**
 * neues fenster mit def. groesse, ohne statusbar oder navigation etc.
**/ 
function openPopup(uri,sizex,sizey)
{
  var ratio = 30;
  sizex = sizex*1+ratio;
  sizey = sizey*1+ratio;
  var path = uri+"&sizex="+sizex+"&sizey="+sizey;
  name = window.open(path,'new_win',"width=" + sizex + ",height=" + sizey + ",screenX=screen.width / 2 - sizex / 2,screenY=screen.height / 2 - sizey / 2,resizable=no,scrollbars");
}



/**
 * farbaenderung von tabellenzeilen
 * strings: textfarbe, hintergrundfarbe, cursor-style
**/ 
function hoverTD(obj, color, colorBg, cursor)
{
  if (!(document.layers && !document.getElementById))
  {
    if (colorBg != '')
      obj.style.backgroundColor = colorBg;
    if (cursor != '')
      obj.style.cursor = cursor;
    if (obj.children)
      obj.children[0].style.color = color;
  }
}


/**
 * Sichtbarkeit ändern
**/ 
function setDisplayByElementId(id, vis_arg)
{
  if(document.layers)
    document.layers[id].display = vis_arg;
  else if(document.all)
    document.all[id].style.display = vis_arg;
  else if(document.getElementById)
    document.getElementById(id).style.display = vis_arg;
}


/**
 * Bestaetigung bei Loeschvorgang
 * strings: textfarbe, hintergrundfarbe, cursor-style
**/ 
function confirmDelete(url,text)
{
  boole = confirm(text);
  if(boole)
    self.location.href = url;
}



/**
 * Aendert die `action` eines Formulares
 *
 * @param  form_name    Formular-Bezeichner
 * @param  new_action   Neue `action`
 */
function changeAction(form_name,new_action)
{
  document.forms[form_name].action = new_action;
}



/**
 * Selektiert oder deselektiert alle Checkboxen eines Formulares
 *
 * @param   string   the form name
 * @param   boolean  whether to check or to uncheck the element
 *
 * @return  boolean  always true
 */
function setCheckboxes(the_form, the_checkboxes)
{
  do_check = document.forms[the_form].elements['toggle'].checked;
  
  var boxes = document.forms[the_form].elements[the_checkboxes];
  var boxes_cnt = (typeof(boxes.length) != 'undefined') ? boxes.length : 0;

  if (boxes_cnt)
  {
    for (var i = 0; i < boxes_cnt; i++)
      boxes[i].checked = do_check;
  }
  else
    boxes.checked = do_check;

  return true;
}



  /**
   * ueberpruefung, ob fuer `formular` das objekt `objekt` (radiobutton oder
   * checkbox) angehakt/ausgewaehlt ist
   *
   * @param   form_element  Checkbox oder Radio-Button
   * @return  boolean      (true|false)
  **/ 
  function checkFM(form_element, msg_)
  {
    if(form_element.checked)
      return true;
    else
    {
      alert(msg_);
      return false;
    }
  }