var digits = "0123456789";
var phoneNumberDelimiters = "()- ";
var validWorldPhoneChars = phoneNumberDelimiters + "+";
var minDigitsInIPhoneNumber = 5;
function isInteger(s)
{   var i;
    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    return true;
}
function stripCharsInBag(s, bag)
{   var i;
    var returnString = "";
    for (i = 0; i < s.length; i++)
    {   
        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 validateform()
{
	
	if((document.contact.txtConPerson.value=="")||(document.contact.txtConPerson.value==null)||(document.contact.txtConPerson.value==0))
	{
	alert('Please enter your contact person.');
	document.contact.txtConPerson.focus();
	return false;
	}
		
	if((document.contact.txtcompany.value=="")||(document.contact.txtcompany.value==null)||(document.contact.txtcompany.value==0))
	{
	alert('Please enter your company name.');
	document.contact.txtcompany.focus();
	return false;
	}
			
	if(document.contact.txtEmail.value=="")
	{

	alert('Please enter your email address!');
	document.contact.txtEmail.focus();
	return false;
	}
	var Temp     =document.contact.txtEmail;
	var AtSym    = Temp.value.indexOf('@');
	var Period   = Temp.value.lastIndexOf('.');
	var Space    = Temp.value.indexOf(' ');
	var Length   = Temp.value.length - 1;
	
	if(AtSym < 1 || Period <= AtSym+1 || Period == Length || Temp.value=='')
	{
	alert('Invalid email address');
	document.contact.txtEmail.focus();
	return false;
	}
	
	if ((document.contact.txtPhone.value==null)||(document.contact.txtPhone.value=="")){
		alert("Please enter your phone number")
		document.contact.txtPhone.focus();
		return false
	}
	if (checkInternationalPhone(document.contact.txtPhone.value)==false){
		alert("Invalid phone number")
		document.contact.txtPhone.value=""
		document.contact.txtPhone.focus();
		return false
	}
	
	if((document.contact.txtSubject.value=="")||(document.contact.txtSubject.value==null)||(document.contact.txtSubject.value==0))
	{
	alert('Please enter the subject');
	document.contact.txtSubject.focus();
	return false;
	}
			
	if((document.contact.txtMessage.value=="")||(document.contact.txtMessage.value==null)||(document.contact.txtMessage.value==0))
	{
	alert('Please enter your comments');
	document.contact.txtMessage.focus();
	return false;
	}	

		if((document.contact.captcha.value=="")||(document.contact.captcha.value==null)||(document.contact.captcha.value==0))
		{
		alert('Please enter the verification code');
		document.contact.captcha.focus();
		return false;
	};
		
return true;
}