Show/Hide Div based on Select Box Choice

Ok so I have a select box where the value must be passed via the form. If the users selects choice B or Choice C then I want a specific div to show. If they choose choice A then I want the div to hide or remain hidden. It should be hidden on page load.

<select name="Event_Type_ID">
    <option value="1">Choice A</option>
    <option value="2">Choice B</option>
    <option value="3">Choice C</option>

<div id="showme">
 Content to show if EITHER Choice B or C is chosen. Otherwise this div  should be hidden.

Can anyone lead me in the right direction?

Set up an onchange event for the select box.

In the function find out which option is currently selected.
If it’s the first one, hide the div, otherwise show it.