// JavaScript Document
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 = 2;

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 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 ValidateForm(){
	var contact_name	=document.getElementById("phone4");
	var contact_phone	=document.getElementById("email3");
	var emailID			=document.getElementById("date3");
	var event_date		=document.getElementById("date4");
//	var delivery_date	=document.getElementById("delivery_date");
	var poem			=document.getElementById("poem");
	var song			=document.getElementById("song");
	var subject_name	=document.getElementById("sname3");
	var subject_birth	=document.getElementById("sbirth3");

	if ((contact_name.value==null)||(contact_name.value=="")){
		alert("Please enter your contact name ")
		contact_name.focus()
		return false
	}
	
	
	if ((contact_phone.value==null)||(contact_phone.value=="")){
		alert("Please enter your phone number ")
		contact_phone.focus()
		return false
	}
	if (checkInternationalPhone(contact_phone.value)==false){
		alert("Please enter a valid phone number")
		contact_phone.value=""
		contact_phone.focus()
		return false
	}
	

	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please enter your email id")
		emailID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}


	if ((event_date.value==null)||(event_date.value=="")){
		alert("Please enter your date of event") 
		event_date.focus()
		return false
	}


/*	if ((delivery_date.value==null)||(delivery_date.value=="")){
		alert("Please enter your delivery date")
		delivery_date.focus()
		return false
	}
*/
	
	if(poem.checked==false && song.checked==false){
		alert("Please select poem or song")
		poem.focus()
		return false
	}
	
	if ((subject_name.value==null)||(subject_name.value=="")){
		alert("Please enter your subject's name ")
		subject_name.focus()
		return false
	}

	if ((subject_birth.value==null)||(subject_birth.value=="")){
		alert("Please enter your subject's birthdate/place ")
		subject_birth.focus()
		return false
	}

	return true
}