function checkOfferEmail() {
var email = document.getElementById('offer_email');
var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
if (!filter.test(email.value)) {
alert('Please provide a valid email address');

email.focus;
return false;
}
return false;
}

function checkOfferPhone() {
var phone = document.getElementById('offer_phone');
var filter = /(^-?\d\d*\.\d*$)|(^-?\d\d*$)|(^-?\.\d\d*$)/;
if (!filter.test(phone.value)) {
alert('Please provide a valid phone number');

email.focus;
return false;
}
}