function gid (id)
{
    return document.getElementById(id);
}

function isMail (mail)
{
    var regExp = new RegExp("[A-Za-z0-9_]+([-+.][A-Za-z0-9_]+)*@[A-Za-z0-9_]+([-.][A-Za-z0-9_]+)*\\.[A-Za-z0-9_]{2,}([-.][A-Za-z0-9_]+)*");
    var result = regExp.exec(mail);
    return (null == result) ? false : true;
}

function isNotEmpty (value)
{
    var regExp = new RegExp("(.)+");
    var result = regExp.exec(value);
    return (null == result) ? false : true;
}

function validation ()
{
	
    var errors = '';
    if (false === isNotEmpty(gid('first_name').value)) {
        errors += "Please enter First Name\n";
	}

    if (false === isNotEmpty(gid('last_name').value)) {
        errors += "Please enter Last Name\n";
	}
	
    if (false === isMail(gid('email').value)) {
        errors += "Please enter E-mail address\n";
	}

    if (false === isNotEmpty(gid('phone').value)) {
        errors += "Please enter Telephone No.\n";
	}
	
    if (false === isNotEmpty(gid('inquiry').value)) {
        errors += "Please enter Inquiry\n";
	}
	
    if ('' != errors) {
         alert(errors);
         return false;
    } else {
         $('form').submit();
    }
}