var personWin;
var imageWin

function personPopUp(URL)
{
  personWin = openCenteredWindow(URL, 240, 300, 'PersonPopup', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizeable=0');
}

function imagePopUp(URL)
{
  imageWin = openCenteredWindow(URL, 600, 400, 'ImagePopup', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=1');
}

function openCenteredWindow(url, width, height, name, parms)
{
  var left = Math.floor((getWinWidth() - width) / 2) + getScreenLeft();
  var top = Math.floor((getWinHeight() - height) / 2) + getScreenTop();
  var winParms = "top=" + top + ",left=" + left + ",height=" + height + ",width=" + width;
  if (parms) {
    winParms += "," + parms;
  }
  var win = window.open(url, name, winParms);
  if (parseInt(navigator.appVersion) >= 4) {
    win.window.focus();
  }
  return win;
}

function getWinWidth()
{
  var winW = 630;
  if (parseInt(navigator.appVersion) > 3) {
    if (navigator.appName == "Netscape") {
      winW = window.innerWidth;
    }
    if (navigator.appName.indexOf("Microsoft") != -1) {
      winW = document.body.offsetWidth;
    }
  }
  return winW;
}

function getWinHeight()
{
  var winH = 460;
  if (parseInt(navigator.appVersion) > 3) {
    if (navigator.appName == "Netscape") {
      winH = window.innerHeight;
    }
    if (navigator.appName.indexOf("Microsoft") != -1) {
      winH = document.body.offsetHeight;
    }
  }
  return winH;
}

function getScreenLeft()
{
  var scrLeft = 100;
  if (parseInt(navigator.appVersion) > 3) {
    if (navigator.appName == "Netscape") {
      scrLeft = window.screenX;
    }
    if (navigator.appName.indexOf("Microsoft") != -1) {
      scrLeft = window.screenLeft;
    }
  }
  return scrLeft;
}

function getScreenTop()
{
  var scrTop = 100;
  if (parseInt(navigator.appVersion) > 3) {
    if (navigator.appName == "Netscape") {
      scrTop = window.screenY;
    }
    if (navigator.appName.indexOf("Microsoft") != -1) {
      scrTop = window.screenTop;
    }
  }
  return scrTop;
}

function validateGuestbookEntry()
{
  var message = mainform.Message.value;
  var name = mainform.Name.value;
  var verification = mainform.Verification.value;
  
  if (message.length <= 1) {
    alert('Du måste skriva något!');
    event.returnValue = false;
    return
  }
  if (name == '') {
    alert('Du måste ange ditt namn!');
    event.returnValue = false;
    return;
  }
  /*
  if (verification != Session("ImageNo")) {
    alert(verification);
    //alert(Session("ImageNo")%>');
    alert('Fel verifieringsnummer!');
    event.returnValue = false;
    return;
  }
  */
}