CODE
<script language="javascript">if (box == "login") {</script>
<div class="login">
<p align="center" class="style15">Login</p>
<form id="form1" name="form1" method="post" action="login.php">
<label><span class="style11"> Username:</span>
<br />
<input type="text" name="user" id="user" />
</label>
<label><span class="style11"> Password:</span>
<br />
<input type="password" name="pass" id="pass" />
</label>
<label><br />
<input type="checkbox" name="remember" id="remember" />
<span class="style14">remember me</span> </label>
<br /><br />
<div align="center">
<input type="submit" name="Submit" id="Submit" value="Submit" />
</div>
</form>
</div>
<script language="javascript">} else if (box == "register") {</script>
<div class="login">
</div>
<script language="javascript">}</script>
<div id="logintab" onclick="document.getElementById('logintab').style.background-image='url(Images/tab_on.png)';
document.getElementById('registertab').style.background-image='url(Images/tab_off.png)';
var box='login';">
</div>
<div id="registertab" onclick="document.getElementById('registertab').style.background-image='url(Images/tab_on.png)';
document.getElementById('logintab').style.background-image='url(Images/tab_off.png)';
var box='register';">
</div>
<div class="login">
<p align="center" class="style15">Login</p>
<form id="form1" name="form1" method="post" action="login.php">
<label><span class="style11"> Username:</span>
<br />
<input type="text" name="user" id="user" />
</label>
<label><span class="style11"> Password:</span>
<br />
<input type="password" name="pass" id="pass" />
</label>
<label><br />
<input type="checkbox" name="remember" id="remember" />
<span class="style14">remember me</span> </label>
<br /><br />
<div align="center">
<input type="submit" name="Submit" id="Submit" value="Submit" />
</div>
</form>
</div>
<script language="javascript">} else if (box == "register") {</script>
<div class="login">
</div>
<script language="javascript">}</script>
<div id="logintab" onclick="document.getElementById('logintab').style.background-image='url(Images/tab_on.png)';
document.getElementById('registertab').style.background-image='url(Images/tab_off.png)';
var box='login';">
</div>
<div id="registertab" onclick="document.getElementById('registertab').style.background-image='url(Images/tab_on.png)';
document.getElementById('logintab').style.background-image='url(Images/tab_off.png)';
var box='register';">
</div>