function checkForm(form, fields) {

    for (var i = 0; i < fields.length; i++)
    {
        if (form.elements[fields[i]].value == "")
        {
            window.alert("Please fill in " + fields[i] + "!");
            return false;
        }
    }

    return true;
}

function winOpen(adr, lang) {

    window.open("/template/include/content/showAdress.jsp?language=" + lang + "&adress=" + adr, "mail", "toolbar=no, width=200, height=75, status=no, scrollbars=no, resize=no, menubars=no, status=no");
}

function showMenu() {
    document.getElementById('m').style.visibility = 'visible';
}

function hideMenu() {
    document.getElementById('m').style.visibility = 'hidden';
}

function checkLettersForm(form, msg) {

    if (form.elements['american'].checked == false && form.elements['european'].checked == false) {
        window.alert(msg);
        return false;
    }

    return true;
}

function copyrightBox() {
  toggleElement('shade');
  toggleElement('copyright_box');  

  document.getElementById('shade').style.width = document.getElementById('intrafish').offsetWidth + "px";
  document.getElementById('shade').style.height = document.getElementById('intrafish').offsetHeight + "px";

  document.getElementById('copyright_box').style.left = ((document.getElementById('intrafish').offsetWidth / 2) - 
                                                         (document.getElementById('copyright_box').offsetWidth / 2)) +  
                                                         "px";

  if (document.body && document.documentElement.clientHeight) {
    //IE
    var windowHeight = document.documentElement.clientHeight / 2;
  }
  else {
    //Normal browsers
    var windowHeight = window.innerHeight / 2;
  }

  if(document.documentElement && document.documentElement.scrollTop) {
    //IE
    var scrollY = document.documentElement.scrollTop;
  }  
  else {
    //Normal browsers
    var scrollY = document.body.scrollTop;
  }
 
  document.getElementById('copyright_box').style.top = (scrollY + (windowHeight -
                                                        (document.getElementById('copyright_box').offsetHeight / 2))) + 
                                                        "px";
}

function toggleElement(e) {
  var obj = document.getElementById(e);
  if(obj.style.display == 'block') {
    obj.style.display = 'none';
  }
  else {
    obj.style.display = 'block';  
  }
}