function cancel_form() {
  window.location.href=document.getElementById("referer_value").value; 
}

function isEmail(sEmail) 
{ 
	sEmail = sEmail.replace( new RegExp('/\(.*?\)/'), '' );
	oRegExp = /^[A-Za-z0-9][-\w]*(\.[A-Za-z0-9][-\w]*)*@[A-Za-z0-9][-\w]*(\.[A-Za-z0-9][-\w]*)*\.[a-zA-Z]{2,4}$/;
	return oRegExp.test(sEmail);
} 

function isPhone(sPhone) 
{
	sPhone = sPhone.replace( /[\s\-\(\)\.\]\[]/g, '' );
	oRePhone = /^\+*\d{7,15}(\+\d{2,4})?$/;
	return oRePhone.test(sPhone);
}