Check if mouse is inside div
<p>I want to use an if statement to check if the mouse is inside a certain div, something like this:</p>

<pre><code>if ( mouse is inside #element ) {
 // do something
} else {
 return;
}
</code></pre>

<p>This will result in the function to start when the mouse is inside #element, and stops when the mouse is outside #element.</p>