// Phone number Validation

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);

}



// E- Mail Validation

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					

	}



function chkForm()

{

	var name = document.getElementById("name");

	var email = document.getElementById("email");

	var phone = document.getElementById("phone");

	//var message = document.getElementById("message");

	

	if(name.value=='')

	{

		alert("Please Enter Name");

		name.focus();

		return false;	

	}

	if(email.value=='')

	{

		alert("Please Enter Email");

		email.focus();

		return false;	

	}

	if (echeck(email.value)==false){

		email.value=""

		email.focus()

		return false

	}

	if(phone.value=='')

	{

		alert("Please Enter Phone Number");

		phone.focus();

		return false;	

	}

	if (checkInternationalPhone(phone.value)==false){

		alert("Please Enter a Valid Phone Number")

		phone.value=""

		phone.focus()

		return false

	}

	/*if(message.value=='')

	{

		alert("Please Enter Message");

		message.focus();

		return false;	

	}
*/
}