function clearInput(element) {
  if (element.value == element.defaultValue) 
  {
   element.value = "";
   return true;
  } else {    
   return false;  
  }
}

function revalueInput(element) {
  if (element.value == "") 
  {
   element.value = element.defaultValue;
   return true;
  } else {    
   return false;  
  }
}



/* Kopiert aus phpMyAdmin: confirmLink*/
/**
 * Displays an confirmation box before to submit a "DROP/DELETE/ALTER" query.
 * This function is called while clicking links
 *
 * @param   object   the link
 * @param   object   the sql query to submit
 *
 * @return  boolean  whether to run the query or not
 */
function confirmDelete(theLink, MachineInfo)
{

    var is_confirmed = confirm("Wollen Sie die Maschine " + '\n' + MachineInfo + '\n' + "wirklich löschen?");
    if (is_confirmed) {
        if ( typeof(theLink.href) != 'undefined' ) {
            theLink.href += '&is_js_confirmed=1';
        } else if ( typeof(theLink.form) != 'undefined' ) {
            theLink.form.action += '?is_js_confirmed=1';
        }
    }

    return is_confirmed;
} // end of the 'confirmLink()' function