// JavaScript Document
// 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()
{
	if(document.getElementById('name').value == "")
	{
		alert("Please Enter Your Name");
		document.getElementById('name').value="";
		document.getElementById('name').focus();
		return false;
	}
	else if (!document.getElementById('name').value.match(/^[A-Za-z\ ]+$/))
	{
		alert("Please enter alphabets only for name");
		document.getElementById('name').value="";
		document.getElementById('name').focus();
		return false;
	}
	
	if(document.getElementById('email').value=="")
	{
		alert("Please Enter your Email Address");
		document.getElementById('email').value="";
		document.getElementById('email').focus();
		return false;	
	}
	else
	{
		checkEmail=document.getElementById('email').value;
		if((checkEmail.indexOf('@') < 0) || ((checkEmail.charAt(checkEmail.length-4) != '.') 
		&& (checkEmail.charAt(checkEmail.length-3) != '.'))) 
		{
			alert("You have entered an invalid email address!Please try again.");
			document.getElementById('email').value="";
			document.getElementById('email').focus();
			return false;
		}
	}
	
	var Phone=document.frm.phone
	
	if ((Phone.value==null)||(Phone.value==""))
	{
		alert("Please Enter your Phone Number")
		Phone.focus()
		return false
	}
	else if (checkInternationalPhone(Phone.value)==false)
	{
		alert("Please Enter a Valid Phone Number")
		Phone.value=""
		Phone.focus()
		return false
	}
	

	if(document.getElementById('comment').value == "")
	{
		alert("Please Enter Comment");
		document.getElementById('comment').value="";
		document.getElementById('comment').focus();
		return false;
	}

	document.getElementById('frm').submit();
}