 
                 <Panel header={@get_panel_header('area-chart', 'Use R in SageMath worksheets')} eventKey='6'>
                     <p>
-                        <a target="_blank" href="https://www.youtube.com/watch?v=JtVuX4yb70A"><Icon name="youtube-play" /> video</a>
-                    </p>
-                    <p>
-                        In a project, click <span style={color:"#08c"}><Icon name="plus-circle" /> New</span> then the
+                        <a target='_blank' href='https://www.youtube.com/watch?v=JtVuX4yb70A'><Icon name='youtube-play' /> video</a>
+                    </p>
+                    <p>
+                        In a project, click <span style={color:'#08c'}><Icon name='plus-circle' /> New</span> then the
                         "Sage" button.  In the worksheet that appears, type <pre>%default_mode r</pre>
                         then press shift+enter.
                         For the reset of the worksheet, type normal R commands, followed by shift+enter.
                         Plotting should just work as usual in R.
-                        See <a target="_blank" href="https://github.com/haraldschilly/sage-cloud-templates/tree/master/r">these
+                        See <a target='_blank' href='https://github.com/haraldschilly/sage-cloud-templates/tree/master/r'>these
                         example worksheets</a>.
                     </p>
                 </Panel>

                        To easily copy our collection of examples into a project, just click "+New", paste in this link<pre>https://github.com/sagemath/cloud-examples.git</pre> and click "From Web".  In a few seconds you will find a directory <pre>sage-cloud-templates</pre> in your project, full of examples.
                    </div>

                    <div style={color:"#666"}>
                        <h4>Technical Notes</h4>
                        <ul>
                            <li>The collection of examples is a <a target="_blank" href="https://github.com/haraldschilly/sage-cloud-templates">Github repository</a>, which we regularly update.
                                In a terminal in the sage-cloud-templates directory, you can type
                                <pre>git pull</pre>
                                to get the latest changes and
                                examples (you may have to type <span style={fontFamily:"monospace"}>"git commit -a"</span> first,
                                if you have made changes). You can also
                                <a href="https://github.com/haraldschilly/sage-cloud-templates/commits/master" target="_blank"> see
                                what is new in the Github repository</a>.
                            </li>
                        </ul>


                <Panel header={@get_panel_header('line-chart', 'Watch a March 2015 talk about all of the main features of SageMathCloud')} eventKey='4'>
                    William Stein (lead developer of SageMathCloud) gave the following one-hour talk in March 2015 at
                    the <a target='_blank' href='http://escience.washington.edu/'>UW eScience Institute</a>:
                    <p>
                        <a target='_blank' href='https://www.youtube.com/watch?v=_ff2HdME8MI'><Icon name='youtube-play' /> video</a>
                    </p>
                </Panel>

                <Panel header='$x^2$ Using $\LaTeX$' eventKey='5' className='salvus-mathjax-on-startup'>
                    <ul>
                        <li><a target='_blank' href='https://www.youtube.com/watch?v=IaachWg4IEQ'><Icon name='youtube-play' /> video1</a></li>
                        <li><a target='_blank' href='https://www.youtube.com/watch?v=cXhnX3UtizI'><Icon name='youtube-play' /> video2</a></li>
                        <li><a target='_blank' href='https://www.youtube.com/playlist?list=PLnC5h3PY-znxc090kGv7W4FpbotlWsrm0'>
                        <Icon name='youtube-play' /> Introduction to $\LaTeX$ by Vincent Knight </a></li>
                    </ul>

                    <p>
                        <a target='_blank' href='http://www.latex-project.org/'>$\LaTeX$</a> is a system for creating
                        professional quality documents, with excellent support for typesetting mathematical formulas
                        like {@insert_sample_function()}.
                        There are two main ways to use latex in the SageMathCloud:
