function listSignUp(form)
{
var field = form.email; // email field
var str = field.value; // email string
var reg1 = /(@.*@)|(\.\.)|(@\.)|(\.@)|(^\.)/; // not valid
var reg2 = /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$/; // valid
if (!reg1.test(str) && reg2.test(str))
{
return true;
}
alert("Did you mean to type: " + str + "? It doesn't look quite right. Please try again.");
field.focus();
field.select();
return false;
}