Place the first image as a background-image on the body with this style:-
body { background-image: url(image.jpg); background-position: top center; }
and the other image as a background-image for a wrapper div:-
#wrapper { width: 100%; background-image: url(image2.jpg); background-position: top right; }
http://www.w3schools.com/css/pr_background-position.asp
<body>
<div id="wrapper>
All your content here
</div>
</body>
Code downloaded to my PC will be deleted in due course.
WIN7; IE9, Firefox, Opera, Chrome and Safari for Windows; screen resolution usually 1366*768.
Also IE6 on W98 with 800*600 and IE8 on Vista 1440*900.