// form validation function //
function validate(form) {
  var Parents_First_Name = form.Parents_First_Name.value;
  var Parents_Last_Name = form.Parents_Last_Name.value;
  var K1_First_Name = form.K1_First_Name.value;
  var K1_Last_Name = form.K1_Last_Name.value;
  var K2_First_Name = form.K2_First_Name.value;
  var K2_Last_Name = form.K2_Last_Name.value;
  var K3_First_Name = form.K3_First_Name.value;
  var K3_Last_Name = form.K3_Last_Name.value;
  var Address = form.Address.value;
  var City = form.City.value;
  var State = form.State.value;
  var ZIP = form.ZIP.value;
  var Parents_Email = form.Parents_Email.value;
  var Source = form.Source.value;
  var nameRegex = /^[a-zA-Z]+(([\'\,\.\- ][a-zA-Z ])?[a-zA-Z]*)*$/;
  var emailRegex = /^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/;

  if(Parents_First_Name == "") {
    inlineMsg('Parents_First_Name','You must enter your first name.',2);
    return false;
  }
  else if(!Parents_First_Name.match(nameRegex)) {
    inlineMsg('Parents_First_Name','You must enter a valid first name.',2);
    return false;
  }
  else if(Parents_Last_Name == "") {
    inlineMsg('Parents_Last_Name','You must enter your last name.',2);
    return false;
  }
  else if(!Parents_Last_Name.match(nameRegex)) {
    inlineMsg('Parents_Last_Name','You must enter a valid last name.',2);
    return false;
  }
  else if(K1_First_Name == "") {
    inlineMsg('K1_First_Name','You must register the first name of at least one child.',2);
    return false;
  }
  else if(!K1_First_Name.match(nameRegex)) {
    inlineMsg('K1_First_Name','You must enter a valid first name.',2);
    return false;
  }
  else if(K1_Last_Name == "") {
    inlineMsg('K1_Last_Name','You must register the last name of at least one child.',2);
    return false;
  }
  else if(!K1_Last_Name.match(nameRegex)) {
    inlineMsg('K1_Last_Name','You must enter a valid last name.',2);
    return false;
  }
  if(K2_First_Name != "" && !K2_First_Name.match(nameRegex)) {
    inlineMsg('K2_First_Name','You must enter a valid first name.',2);
    return false;
  }
  if(K2_Last_Name != "" && !K2_Last_Name.match(nameRegex)) {
    inlineMsg('K2_Last_Name','You must enter a valid last name.',2);
    return false;
  }
  if(K3_First_Name != "" && !K3_First_Name.match(nameRegex)) {
    inlineMsg('K3_First_Name','You must enter a valid first name.',2);
    return false;
  }
  if(K3_Last_Name != "" && !K3_Last_Name.match(nameRegex)) {
    inlineMsg('K3_Last_Name','You must enter a valid last name.',2);
    return false;
  }
  else if(Address == "") {
    inlineMsg('Address','<strong>Error</strong><br />You must enter your address.',2);
    return false;
  }
  else if(City == "") {
    inlineMsg('City','<strong>Error</strong><br />You must enter your city.',2);
    return false;
  }
  else if(State == "") {
    inlineMsg('State','<strong>Error</strong><br />You must enter your state.',2);
    return false;
  }
  else if(ZIP == "") {
    inlineMsg('ZIP','<strong>Error</strong><br />You must enter your ZIP.',2);
    return false;
  }
  else if(Parents_Email == "") {
    inlineMsg('Parents_Email','<strong>Error</strong><br />You must enter your email.',2);
    return false;
  }
  else if(!Parents_Email.match(emailRegex)) {
    inlineMsg('Parents_Email','<strong>Error</strong><br />You have entered an invalid email.',2);
    return false;
  }
  else if(Source == "") {
    inlineMsg('Source','<strong>Error</strong><br />Please take a moment to tell us how you heard about the Kids Club.',2);
    return false;
  }
  return true;
}

// START OF MESSAGE SCRIPT //

var MSGTIMER = 20;
var MSGSPEED = 5;
var MSGOFFSET = 3;
var MSGHIDE = 3;

// build out the divs, set attributes and call the fade function //
function inlineMsg(target,string,autohide) {
  var msg;
  var msgcontent;
  if(!document.getElementById('msg')) {
    msg = document.createElement('div');
    msg.id = 'msg';
    msgcontent = document.createElement('div');
    msgcontent.id = 'msgcontent';
    document.body.appendChild(msg);
    msg.appendChild(msgcontent);
    msg.style.filter = 'alpha(opacity=0)';
    msg.style.opacity = 0;
    msg.alpha = 0;
  } else {
    msg = document.getElementById('msg');
    msgcontent = document.getElementById('msgcontent');
  }
  msgcontent.innerHTML = string;
  msg.style.display = 'block';
  var msgheight = msg.offsetHeight;
  var targetdiv = document.getElementById(target);
  targetdiv.focus();
  var targetheight = targetdiv.offsetHeight;
  var targetwidth = targetdiv.offsetWidth;
  var topposition = topPosition(targetdiv) - ((msgheight - targetheight) / 2);
  var leftposition = leftPosition(targetdiv) + targetwidth + MSGOFFSET;
  msg.style.top = topposition + 'px';
  msg.style.left = leftposition + 'px';
  clearInterval(msg.timer);
  msg.timer = setInterval("fadeMsg(1)", MSGTIMER);
  if(!autohide) {
    autohide = MSGHIDE;  
  }
  window.setTimeout("hideMsg()", (autohide * 1000));
}

// hide the form alert //
function hideMsg(msg) {
  var msg = document.getElementById('msg');
  if(!msg.timer) {
    msg.timer = setInterval("fadeMsg(0)", MSGTIMER);
  }
}

// face the message box //
function fadeMsg(flag) {
  if(flag == null) {
    flag = 1;
  }
  var msg = document.getElementById('msg');
  var value;
  if(flag == 1) {
    value = msg.alpha + MSGSPEED;
  } else {
    value = msg.alpha - MSGSPEED;
  }
  msg.alpha = value;
  msg.style.opacity = (value / 100);
  msg.style.filter = 'alpha(opacity=' + value + ')';
  if(value >= 99) {
    clearInterval(msg.timer);
    msg.timer = null;
  } else if(value <= 1) {
    msg.style.display = "none";
    clearInterval(msg.timer);
  }
}

// calculate the position of the element in relation to the left of the browser //
function leftPosition(target) {
  var left = 0;
  if(target.offsetParent) {
    while(1) {
      left += target.offsetLeft;
      if(!target.offsetParent) {
        break;
      }
      target = target.offsetParent;
    }
  } else if(target.x) {
    left += target.x;
  }
  return left;
}

// calculate the position of the element in relation to the top of the browser window //
function topPosition(target) {
  var top = 0;
  if(target.offsetParent) {
    while(1) {
      top += target.offsetTop;
      if(!target.offsetParent) {
        break;
      }
      target = target.offsetParent;
    }
  } else if(target.y) {
    top += target.y;
  }
  return top;
}

// preload the arrow //
if(document.images) {
  arrow = new Image(7,80); 
  arrow.src = "images/msg_arrow.gif"; 
}