// 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 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){
	s=stripCharsInBag(strPhone,validWorldPhoneChars);
	return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}

function ValidateForm(){
	var Fname=document.myform.first_name;
	var Lname=document.myform.last_name;
	var emailAddr=document.myform.email;
	var QuestionsComments=document.myform.description;
	var TimeToCall=document.myform.time_to_call;
	var PhoneNum=document.myform.phone;
	var WebsiteURL=document.myform.URL;

	if((Fname.value=="")||(Lname.value=="")||(TimeToCall.value=="0")||(QuestionsComments.value=="0")||(WebsiteURL.value==""))
	{
		window.alert("Please complete all fields.");
		return false;
	}
	if ((PhoneNum.value==null)||(PhoneNum.value=="")){
		alert("Please Enter your Phone Number:\r\nxxx-xxx-xxxx ");
		PhoneNum.focus()
		return false ;
	}
	if (checkInternationalPhone(PhoneNum.value)==false){
		alert("Please Enter your Phone Number:\r\nxxx-xxx-xxxx");
		PhoneNum.value=""
		PhoneNum.focus()
		return false;
	}

	if ((emailAddr.value==null)||(emailAddr.value=="")){
		alert("Please Enter your Email Address")
		emailAddr.focus()
		return false
	}
	if (echeck(emailAddr.value)==false){
		emailAddr.focus()
		return false
	}
	return true;
 }


function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true
	}


var nav = window.Event ? true : false;
if (nav) {
   window.captureEvents(Event.KEYDOWN);
   window.onkeydown = NetscapeEventHandler_KeyDown;
} else {
   document.onkeydown = MicrosoftEventHandler_KeyDown;
}

function NetscapeEventHandler_KeyDown(e) {
  if (e.which == 13 && e.target.type != 'textarea' && e.target.type != 'submit') { return false; }
  return true;
}

function MicrosoftEventHandler_KeyDown() {
  if (event.keyCode == 13 && event.srcElement.type != 'textarea' && event.srcElement.type != 'submit')
    return false;
  return true;
}