// form validation function //
function validate(form) {
	var person_name = form.person_name.value;
	var email = form.email.value;
 	var phone = form.phone.value;
	var how_help = form.how_help.value; 
  
  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);
  if(person_name == "") {
    inlineMsg('person_name','Enter your name.',2);
    return false;
  }
  if(!person_name.match(nameRegex)) {
    inlineMsg('person_name','You have entered an invalid name.',2);
    return false;
  }
  
  if(phone != "" && checkInternationalPhone(phone)==false) {
    inlineMsg('phone','Enter a valid telephone number.',2);
    return false;
  }
  
  if(email == "") {
    inlineMsg('email','Enter your email.',2);
    return false;
  }
  if(!email.match(emailRegex)) {
    inlineMsg('email','You have entered an invalid email.',2);
    return false;
  }
  
  if(how_help == "") {
    inlineMsg('how_help','How can we help you?',2);
    return false;
  }
 /* if(requirement == "") {
    inlineMsg('requirement','You must enter your requirement.');
    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;*/
  
   var topposition = topPosition(targetdiv) - ((msgheight - targetheight) / 2);
  var leftposition = leftPosition(targetdiv)  ;
  
  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 = "msg_arrow.gif"; 
}


function checkInternationalPhone(strPhone){
var bracket=3
strPhone=trim(strPhone)
if(strPhone.indexOf("+")>1) return false
if(strPhone.indexOf("-")!=-1)bracket=bracket+1
if(strPhone.indexOf("(")!=-1 && strPhone.indexOf("(")>bracket)return false
var brchr=strPhone.indexOf("(")
if(strPhone.indexOf("(")!=-1 && strPhone.charAt(brchr+2)!=")")return false
if(strPhone.indexOf("(")==-1 && strPhone.indexOf(")")!=-1)return false
s=stripCharsInBag(strPhone,validWorldPhoneChars);
return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}


 
 
 // Declaring required variables
var digits = "0123456789";
// non-digit characters which are allowed in phone numbers
var phoneNumberDelimiters = "()- ";
// characters which are allowed in international phone numbers
// (a leading + is OK)
var validWorldPhoneChars = phoneNumberDelimiters + "+";
// Minimum no of digits in an international phone no.
var minDigitsInIPhoneNumber = 10;

function isInteger(s)
{   var i;
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}
function trim(s)
{   var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not a whitespace, append to returnString.
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (c != " ") returnString += c;
    }
    return returnString;
}
function stripCharsInBag(s, bag)
{   var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function checkInternationalPhone(strPhone){
var bracket=3
strPhone=trim(strPhone)
if(strPhone.indexOf("+")>1) return false
if(strPhone.indexOf("-")!=-1)bracket=bracket+1
if(strPhone.indexOf("(")!=-1 && strPhone.indexOf("(")>bracket)return false
var brchr=strPhone.indexOf("(")
if(strPhone.indexOf("(")!=-1 && strPhone.charAt(brchr+2)!=")")return false
if(strPhone.indexOf("(")==-1 && strPhone.indexOf(")")!=-1)return false
s=stripCharsInBag(strPhone,validWorldPhoneChars);
return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}



function valid_entry()
{
//replace(/^\s+|\s+$/g, '');
var msg='';
var msg1='..............................................................\n Following Fields are required.\n';
var msg2='..............................................................';
var emailStr = /^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$/;
var urlregex = new RegExp("^(http:\/\/www.|https:\/\/www.|ftp:\/\/www.|www.){1}([0-9A-Za-z]+\.)");

document.getElementById('user_name').value=document.getElementById('user_name').value.replace(/^\s+|\s+$/g, '');
if(document.getElementById('user_name').value=='')
{
 msg+=" - Your Name.\n";
 }
 
 document.getElementById('email').value=document.getElementById('email').value.replace(/^\s+|\s+$/g, '');
if(document.getElementById('email').value=='' )
{
 msg+=" - Youe Email Address.\n";
 }else if (!emailStr.test(document.getElementById('email').value) )
 {
 msg+=" - Valid Email\n";
 }
 
 document.getElementById('phone').value=document.getElementById('phone').value.replace(/^\s+|\s+$/g, '');
if(document.getElementById('phone').value!='')
{
 if(checkInternationalPhone(document.getElementById('phone').value)==false)
  msg+=" - Valid Phone Number\n";
  } 
 
 
 document.getElementById('url').value=document.getElementById('url').value.replace(/^\s+|\s+$/g, '');
if(document.getElementById('url').value=='' )
{
 msg+=" - Site URL.\n";
 }else if(!urlregex.test(document.getElementById('url').value))
 {
  msg+=" - Valid URL.\n";
 }
 
 if(document.getElementById('seo').checked==false && document.getElementById('pay_click').checked==false && document.getElementById('i_marketing').checked==false && document.getElementById('chk_other').checked==false )
 {
   msg+=" - Check Option That About You Learn.\n";
 }else if(document.getElementById('chk_other').checked==true && document.getElementById('other').value.replace(/^\s+|\s+$/g, '')=='')
 {
   msg+=" - Fill Other Textbox.\n";
 }
 
 if(msg!='')
 {
 alert(msg1+msg+msg2);
 return false;
 }
 
}