Change paragraph, variables

<!DOCTYPE html>
<html>
<body onload="runOnLoad()">

<p id="info">Check the box to see hubris in action!</p>
<p id="action"><!--Set with JS--></p>

<script>
var topic = "";
var originalText = "";
var transformedText = "";

function runAction() {
	if(document.getElementById("box").checked) {
    	console.log(document.getElementById("box").isChecked)
    	document.getElementById("action").innerHTML = transformedText;
    } else {
    	document.getElementById("action").innerHTML = originalText;
    }
}
function runOnLoad() {
	document.getElementById("action").innerHTML = originalText;
    document.getElementById("checkBoxText").innerHTML = "Show " + topic;
    document.getElementById("info").innerHTML = "Check the box to see " + topic + " in action!";
}
</script>

<form id="myform">
   <input type="checkbox" name="checkfield" id="box"  onchange="runAction(this)"/> <div style="display: inline-block;" id="checkBoxText"></div>
</form>

</body>
</html>