function checkform(myform)
{

//email check
	if (myform.email.value == '')
	{
		alert('Please enter an email address. If you do not wish to include an email address, please call us with your enquiry or booking.');
        myform.email.focus();
		return false;
	}
	else if (myform.email.value != "" )
	{
  	var re = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
  		if (!myform.email.value.match(re)) {
    	alert('Your email address is not in a valid format. Please re-type your email address.');
        myform.email.focus();
    	return false;
  		}

}
	return true;
}