use button to write text to the page
<p>I can do this with a alert but I want to print the results of a function directly to the web page. </p>

<p>When the user clicks the car button I want the results from the <code>car()</code> function to write into my <code>id="mainContent"</code> div.</p>

<p>if the user clicks the Ice Cream button I want the results from the ice cream button to replace what ever is in the <code>mainConten</code>t div with the results from the <code>iceCream()</code> function</p>
