// form validation function //
function validate(form) {

  var firstName = form.firstName.value;
  var lastName = form.lastName.value;
  var email = form.email.value;
  var confirmEmail = form.confirmEmail.value;
  var country = form.country.value;
  var address = form.address.value;
  var city = form.city.value;
  var zip_postal = form.zip_postal.value;
  var phoneNumber = form.phoneNumber.value;
  var websiteName = form.websiteName.value;
  var websiteURL = form.websiteURL.value;
  var impressions = form.impressions.value;
  var channels = form.channels.value;
  var paymentPreference1 = form.paymentPreference1.value;
  var paymentPreference2 = form.paymentPreference2.value;
  var paypalAcc = form.paypalAcc.value;
  
  var emailRegex = /^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/;
  var urlRegex = /http:\/\/[A-Za-z0-9\.-]{3,}\.[A-Za-z]{3}/;
  
  if(firstName == "") {
	inlineMsg('firstName','You must enter your first name.');
    return false;
  }
  if(lastName == "") {
    inlineMsg('lastName','You must enter your last name.');
    return false;
  }
  if(email == "") {
    inlineMsg('email','You must enter your email.');
    return false;
  }
  if(!email.match(emailRegex)) {
    inlineMsg('email','You have entered an invalid email address.');
    return false;
  }
  if(confirmEmail == "") {
    inlineMsg('confirmEmail','You must enter your email again to confirm.');
    return false;
  }
  if(confirmEmail != email) {
    inlineMsg('confirmEmail','Your email and confirm email fields do not match.');
    return false;
  }
  if(country == "") {
    inlineMsg('country','You must select your country.');
    return false;
  }
  if(address == "") {
    inlineMsg('address','You must enter your address.');
    return false;
  }
  if(city == "") {
    inlineMsg('city','You must enter your city.');
    return false;
  }
  if(zip_postal == "") {
    inlineMsg('zip_postal','You must enter your Zip/Postal Code.');
    return false;
  }
  if(phoneNumber == "") {
    inlineMsg('phoneNumber','You must enter your phone number.');
    return false;
  }
  if(websiteName == "") {
    inlineMsg('websiteName','You must enter the name of your site.');
    return false;
  }
  if(websiteURL == "") {
    inlineMsg('websiteURL','You must enter a web site URL.');
    return false;
  }
  if(!websiteURL.match(urlRegex)) {
    inlineMsg('websiteURL','You have entered an invalid URL.');
    return false;
  }
  if(impressions == "") {
    inlineMsg('impressions','You must enter the number of monthly impressions.');
    return false;
  }
  if(channels == "") {
    inlineMsg('channels','You must select a channel.');
    return false;
  }
  if(!document.form.paymentPreference1.checked && !document.form.paymentPreference2.checked) {
    inlineMsg('paymentPreferenceMsg','You must choose a payment preference.');
    return false;
  }
  if(document.form.paymentPreference1.checked) {
	  if(paypalAcc == "") {
		inlineMsg('paypalAcc','You must enter your Paypal email address.');
		return false;
	  }
	  if(!paypalAcc.match(emailRegex)) {
		inlineMsg('paypalAcc','You have entered an invalid email address.');
		return false;
	  }
  }
  return true;
}

// START OF MESSAGE SCRIPT //

var MSGTIMER = 20;
var MSGSPEED = 5;
var MSGOFFSET = 3;
var MSGHIDE = 4;

// 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"; 
}