Changing IinnerHTML
This fiddle shows how to change the HTML associated with specific IDs.
HTML
<p id="p1">
Nothing here
</p>
<p id="p2">
Here either
</p>
<button onclick="function1()">Button 1</button>
<button onclick="function2()">Button 2</button>
JavaScript
function function1() {
document.getElementById("p1").innerHTML="p1 changed";
}
function function2() {
document.getElementById("p2").innerHTML="p2 changed";
}