// JavaScript Document


var digits = "0123456789";					// non-digit characters which are allowed in phone numbers
var phoneNumberDelimiters = "()- ";   		// characters which are allowed in international phone number   // (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) 
{
	// Remove leading spaces and carriage returns
	while ((s.substring(0,1) == ' ') || (s.substring(0,1) == '\n') || (s.substring(0,1) == '\r'))
	{ s = s.substring(1,s.length); }
	
	// Remove trailing spaces and carriage returns
	while ((s.substring(s.length-1,s.length) == ' ') || (s.substring(s.length-1,s.length) == '\n') || (s.substring(s.length-1,s.length) == '\r'))
	{ s = s.substring(0,s.length-1); }
	
	return s;
} 

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 verifyEmail(str) {
	if(!str.match(/^[\w]{1}[\w\.\-_]*@[\w]{1}[\w\-_\.]*\.[\w]{2,6}$/i)) { 
            return false; 
	}
	return true; 
} 


function check(fm)
{
	name = Trim(fm.name.value);
	if(name	 =="")
	{	
		alert("Please Enter Name.");
		fm.name.focus();
		return false;
	}
	
	if (verifyEmail(fm.email.value) == false) {
        alert("Invalid e-mail address: Please enter a valid e-mail address");
		fm.email.focus();
        return false;
    }
	
	phone = Trim(fm.phone.value)
	if(phone =="")
	{	
		alert("Please Enter Telephone no.");
		fm.phone.focus();
		return false;
	}
	if(phone!="")
	{	
		if (checkInternationalPhone(fm.phone.value)==false){
			alert("Please Enter Proper Phone no.");
			fm.phone.focus();
			return false;
		}
		
	}
	
	comments = Trim(fm.comments.value);
	if(comments =="")
	{	
		alert("Please Enter Comments.");
		fm.comments.focus();
		return false;
	}
	
	

	
	return true;
}