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

var email = form.email.value;

var username =form.user.value;
var phone =form.gsm.value;  

var fname =form.first_name.value;
var lname =form.last_name.value;
var bday  =form.day.value;
var bmonth =form.month.value;
var byear =form.year.value;
var addr =form.address1.value;
var town =form.city.value;
var pcode =form.postcode.value;
var countr =form.country.value;
var passw =form.pwd1.value;
var confpassw =form.pwd2.value;
var terms =form.checkbox.checked;

 
  
  var nameRegex = /^[a-zA-Z]+(([\'\,\.\- ][a-zA-Z ])?[a-zA-Z]*)*$/;
  var emailRegex = /^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/;
  var messageRegex = new RegExp(/<\/?\w+((\s+\w+(\s*=\s*(?:".*?"|'.*?'|[^'">\s]+))?)+\s*|\s*)\/?>/gim);
  var phoneRegex = /^[0-9]+(([\'\,\.\- ][0-9 ])?[0-9]*)*$/;
  
  if(username == "") {
    inlineMsg('user','<strong>Error</strong><br />You must enter your username.',5);
    return false;
  }
  if(username.replace(/\s/g, "")!= username){
  inlineMsg('user','<strong>Error</strong><br />White spaces are not allowed in the username.',5);
  return false;
  }
  if(username.length < 5) {
    inlineMsg('user','<strong>Error</strong><br />The username must be at least 5 characters long.',5);
    return false;
  }
  if(passw == "") {
    inlineMsg('pwd1','<strong>Error</strong><br />You must enter your password.',5);
    return false;
  }
  if(passw.replace(/\s/g,"")!= passw){
  inlineMsg('pwd1','<strong>Error</strong><br />White spaces are not allowed in the password.',5);
  return false;
  }
  if(confpassw == "") {
    inlineMsg('pwd2','<strong>Error</strong><br />You must confirm your password.',5);
    return false;
  }
  
  if(confpassw != passw) {
    inlineMsg('pwd2','<strong>Error</strong><br />Your passwords do not match.',5);
    return false;
  }
  if(confpassw.length < 5) {
    inlineMsg('pwd1','<strong>Error</strong><br />The password must be at least 5 characters long.',5);
    return false;
  }
  
  if(phone == "") {
    inlineMsg('gsm','<strong>Error</strong><br />You must enter your phone number.',5);
    return false;
  }
  if(!phone.match(phoneRegex)) {
    inlineMsg('gsm','<strong>Error</strong><br />You have entered an invalid Phone Number.',5);
    return false;
  }
  if(fname == "") {
    inlineMsg('first_name','<strong>Error</strong><br />You must enter your first name.',5);
    return false;
  }
  if(lname == "") {
    inlineMsg('last_name','<strong>Error</strong><br />You must enter your last name.',5);
    return false;
  }
  if(email == "") {
    inlineMsg('email','<strong>Error</strong><br />You must enter your email.',5);
    return false;
  }
  if(!email.match(emailRegex)) {
     alert('not valid');
    inlineMsg('email','<strong>Error</strong><br />You have entered an invalid email.',5);
    return false;
  }
  if(bday == "-") {
    inlineMsg('day','<strong>Error</strong><br />You must enter your birth date.',5);
    return false;
  }
  if(bmonth == "-") {
    inlineMsg('month','<strong>Error</strong><br />You must enter your birth date.',5);
    return false;
  }
  if(byear == "-") {
    inlineMsg('year','<strong>Error</strong><br />You must enter your birth date.',5);
    return false;
  }
  if(addr == "") {
    inlineMsg('address1','<strong>Error</strong><br />You must enter your address.',5);
    return false;
  }
  if(town == "") {
    inlineMsg('city','<strong>Error</strong><br />You must enter your city.',5);
    return false;
  }
  if(pcode == "") {
    inlineMsg('postcode','<strong>Error</strong><br />You must enter your post code.',5);
    return false;
  }
  if(countr == "-") {
    inlineMsg('country','<strong>Error</strong><br />You must enter your country.',5);
    return false;
  }
  if(terms == false) {
    inlineMsg('checkbox','<strong>Error</strong><br />Please confirm that you have read the terms and conditions.',5);
    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 = 10;
  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"; 
}