function checkform(form){
  var websitereg = /^(http(s?):\/\/)?(www\.)?([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
  var emailreg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
  var phonereg = /^([0-9_\-\(\)\.]{7,12})$/;
  var name = form.contact_name.value;
  var email = form.contact_email.value;
  var phone = form.contact_phone.value;
  var website = form.contact_website.value;
  var visitors = form.contact_visitors.value;
  var purchased = form.contact_purchased.value;
  var comments = form.contact_comments.value;
  var reason = form.contact_reason.value;
  var revenue = form.contact_revenue.value;
  var price = form.contact_price.value;
  
  if(name == '' || email == '' || phone == '' || website == '' || visitors == '' || purchased == '' || reason == '' || price == ''){
    alert('All Fields are Required.');
    return false;
  }else if(phonereg.test(phone) == false) {
    alert('Please check your phone number.');
    return false;
  }else if(emailreg.test(email) == false) {
    alert('Please check your email address.');
    return false;
  }else if(websitereg.test(website) == false) {
    alert('Please check your website URL.');
    return false;
  }else{
    thankyou();
    return true;
  }
}

function thankyou(){
  newwindow=window.open('thankyou.php','name','height=200,width=400');
	if (window.focus) {newwindow.focus()}
}