Random background image in wordpress

Hello everybody,

I just recently opened a wordpress blog (www.agones.eu) and I’m totally new to CSS, that’s why i’m here to ask for your help. I want that the background of my blog would change randomly now and then, but I don’t know ho to do it. I found the plugin:

http://www.district30.net/random-image-widget

and it says I should use a function called echo_random_image(); but I don’t know hot to use it.

I think I should insert it in my style.css file?

here’s the background part:



/*++++++++++++++++++ The BACKGROUND IMAGE +++++++++++++++++++++*/

/*+++++ replace "(images/default.jpg)" with another image from the /images directory of the theme or use the custom background switcher (Appearance - Change Background Image) ++++*/



body {

        background: url(images/hill.jpg) no-repeat 0 0 #fff;

        background-attachment:fixed;

        background-position: bottom center;

        color: #000;

        font-family: Arial, Verdana, sans-serif;

        margin: 0;

        padding: 0;

}



cite {

        font-size: 90%;

        font-style: normal;

}



h1 {    

		font-size:20px;

}



h2 {

        

		font-size:18px;



}



h3 {

		font-size:16px;

}



h4 {

		font-size:15px;

}



h5 {

		font-size:14px;

}



h6 {

		font-size:13px;

}



p, li {

        font: 13px 'Arial', Verdana, sans-serif;

        line-height:17px;

}



how should I modify it?

thank you very much.