Help with If/else Statement please

In my header, I have a login script as follows:

[CODE]<form action=”login.php” method=”post” name=”logForm” id=”logForm” >
<label>Username: </label><input name=”usr_email” type=”text” class=”required” id=”txtbox” size=”20″>
<label>Password: </label><input name=”pwd” type=”password” class=”required password” id=”txtbox” size=”20″>
<input name=”doLogin” type=”submit” id=”doLogin3″ value=”Login”>
</form>[/CODE]

But if the user is logged in then I want it to say:

<h3>Welcome <?php echo $_SESSION[‘user_name’];?></h3>

So how can I please do the “if user is logged in then say welcome else show login script”?

Thanks,
Adey

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