How to use ELSEIF in the sidebar

<?php

if ( is_page('home')) { 

 echo '<li>';

		<h3></h3>
		<iframe>;

 echo '</li>';

} elseif ( is_page('2')) {	

 echo '<li>';

    	<div class="cloud">

 echo '</li>';

} else { 

 echo '<li>';

    	<h3></h3>
		<iframe>;

 echo '</li>';

<?php } ?>

I am trying to make this thing work in my sidebar and i keep getting parse error and have no idea whats wrong. I want to make some html appear in my sidebar on my pages, to modify it so that each time i access the page a different sidebar be generated.

Does anyone care to help a novice?

Thank you very much