get_the_content working with line breaks

Hi guys,
I’m having problem with get_the_content. It doesn’t work with line breaks or white lines. Here is what I’m trying to do:

My goal is to show a post’s content in an article when a user clicks on a link containing the post’s title. It works allright unless there is a line break or a white line in the post. Here is the code:

<?php
                $posts=get_posts();
                echo '<ul id="links">';
                foreach($posts as $post) : setup_postdata($post);
            ?>                     

            <li onclick="document.getElementsByTagName('article')[0].innerHTML='<?php echo get_the_content(); ?>'"><a href='#''><?php the_title(); ?></a></li>    

            <?php
                endforeach;
                echo '</ul>';
            ?>

So how do I get it to work also with line breaks and/or whitelines?