function submitpage()
{
	var fname = document.getElementById("fname").value;
	var email = document.getElementById("email").value;
	var ph = document.getElementById("ph").value;
	
	if(fname == ""){
		alert("Please Enter your name!");
		return false;
	}
	
	if(email == ""){
		alert("Please Enter your Email Id!");
		return false;
	}
	else if(echeck(email) == false){
		return false;
	}
	
	if(ph == ""){
		alert("Please Enter your Phone Number!");
		return false;		
	}
	else if(checkInternationalPhone(ph) == false){
			return false;
	}
	
	return true;
}


/********** Phone Validation Code **********/

// 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);
}

/* Email Validation Code Starts Here */
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
}
/* Email Validation Code Ends Here */