// preload head
var img1 = new Image; img1.src="/img/bg_head.jpg"

// mailto
function email(email_address) 
{
  location.href = "mailto:" + email_address + "";
}

function check_feedback ()
{
  var comment = document.form_feedback.comment.value;

  var error_msg = '';
    
  if(!document.form_feedback.radio_feedback_pos.checked && !document.form_feedback.radio_feedback_neg.checked)
  {
    error_msg = "Bitte stimmen Sie ab indem Sie einen der Punkte markieren.\n";
  }
  
  if(comment == '')
  {
    error_msg = error_msg + "Das Kommentarfeld ist leer.\n";
  }  
  
  if(error_msg != '')
  {
    alert(error_msg);
    return false;
  }
  else 
  {
    alert('Vielen Dank!');
    return true;
  }
}

function display_image(img_id)
{
  for(var i=1; i<=3; i++)
  {
    if(document.getElementById("img" +i+ ""))
    {
      document.getElementById("img" +i+ "").style.display="none";
    }
  }

  if(document.getElementById("img" +img_id+ ""))
  {
    document.getElementById("img" +img_id+ "").style.display="block";
  }

}

function set_hilight (obj)
{
  //var bg_color = '#FDCAC4';
  var bg_color = '#f6e1cd';

  if(obj && obj.value === "")
  {
    obj.style.backgroundColor=bg_color;
    obj.style.borderColor="#C92100";
  }
}

function rm_hilight (obj)
{
  obj.style.backgroundColor='';
  obj.style.borderColor='#999999';
}

function trim(s)
{
  while (s.substring(0,1) == ' ') {
    s = s.substring(1,s.length);
  }
  while (s.substring(s.length-1,s.length) == ' ') {
    s = s.substring(0,s.length-1);
  }
  return s;
}

function updateCart (action, products_id, quantity)
{
  return makeRequest(action, 'add_product=true&products_id=' +products_id+ '&quantity=' +quantity);
}