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css - jQuery mobile background image

I am building a jQuery mobile site, and I am trying to insert a scalable image into the background, which would adjust to screen size of the phone. This is my code:

<!DOCTYPE html> 
<html> 
<head> 
<title>Discover Dubrovnik</title> 
<link rel="stylesheet" href="jquery.mobile-1.0a4.1.min.css" />
<script type="text/javascript" src="jquery-1.5.2.min.js"></script>
<script type="text/javascript" src="jquery.mobile-1.0a4.1.min.js"></script>
<style type="text/css">
.ui-page {
    background: transparent url(image.gif);
}
</style>

</head> 
<body> 

<div data-role="page" data-theme="b">

<div data-role="header">
    <h1>Header tex</h1>
</div><!-- /header -->

<div data-role="content" data-theme="d">    
some text
    </div><!-- /content -->

<div data-role="footer">
<h1>Neki izbornik</h1>
</div>
</div><!-- /page -->

When the window is in fullscreen, I get background image, but when I resize it/make it smaller (like the screen in phones), the image isn't resized and it is not centered, so I can only see one part of it...

Connected jQuery and CSS files are downloaded from jquerymobile.com

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by (71.8m points)

For jquery mobile and phonegap this is the correct code:

<style type="text/css">
body {
    background: url(imgage.gif);
    background-repeat:repeat-y;
    background-position:center center;
    background-attachment:scroll;
    background-size:100% 100%;
}
.ui-page {
    background: transparent;
}
.ui-content{
    background: transparent;
}
</style>

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