How to put a image on a background behind some text

I am very new with HTML, PHP and CSS. So this is going to be a very 'simple' question.

I am still at the beginning of this webpage I want to try and design just for myself... I just want to know how to put the picture I use behind the text and I still want to use the black background color.

Here is the code I have:

<html>

<head>
	<title>My Webpage</title>
</head>

<body bgcolor="black">

<body>
<h1><font face="Forte"
		  color="beige"
		  size="10"
		  <b>Header 1</b>
	</font>
</h1>
<h2><font face="Forte"
		  color="beige"
	      size="6">
		  <b>Header 2</b>
	</font>
</h2>
<img src="WSBack.jpg" width="1250" height="300">
</body>

</html>

The image appears under the Words.

Please help? Thanks