On refresh my background image changes. I need to add a header to change with each background. How would I add an h1 tag to the php. I am unfamiliar with php but I feel like this should be an easy fix.

Here's my script:

<script type="text/javascript"> 
var bgcount = 3;
function changebg() {
var num =  Math.ceil( Math.random() * bgcount );
document.body.background = 'bgs/'+num+'.jpg';
document.body.style.backgroundRepeat = "no-repeat";
document.body.style.backgroundAttachment = "fixed";
document.body.style.backgroundSize = "cover";
}
</script>

Thanks!