Add a msgbox if condition is true

[JohnSmith]

When the user clicks the submit button, I run a function that validates the fields. The page will not submit unless the conditions are met. I want to know how to add a msg box if all the conditions are met....

<form id=Frm name=Frm method="POST" action="Page2.asp" onsubmit="Valid()">


<script language="Javascript">
function Valid()
{
if (Frm.txtName.value == "")
{
alert("Enter Name!");
Frm.txtName.focus();
event.returnValue = false
}
}