Hi!
I have a similar problem. I use script for background changing color in this page - http://souhssz.webnode.com/za-uchjenika/ , but I can't remove picture for li 
The source:
HTML Code:
<script type="text/javascript" src="http://4433.hit.bg/Colorchange/jquery-1.2.6.pack.js"></script>
<script type="text/javascript"> /* -------------- jQuery code --------------- */
$(document).ready(function(){
$("li.one").click( function(){ $
("body").removeClass("bg2 , bg3 , bg4 , bg5 , bg6 bg7").addClass("bg1");
});
$("li.two").click( function(){ $
("body").removeClass("bg1 , bg3 , bg4 , bg5 , bg6 bg7").addClass("bg2");
});
$("li.three").click( function(){ $
("body").removeClass("bg1 , bg2 , bg4 , bg5 , bg6 bg7").addClass("bg3");
});
$("li.four").click( function(){ $
("body").removeClass("bg1 , bg2 , bg3 , bg5 , bg6 bg7").addClass("bg4");
});
$("li.five").click( function(){ $
("body").removeClass("bg1 , bg2 , bg3 , bg4 , bg6 bg7").addClass("bg5");
});
$("li.six").click( function(){ $
("body").removeClass("bg1 , bg2 , bg3 , bg4 , bg5 , bg7").addClass("bg6");
});
$("li.seven").click( function(){ $
("body").removeClass("bg1 , bg2 , bg3 , bg4 , bg5 , bg6").addClass("bg7");
});
});
</script>
<style type="text/css">
* { margin: 0; padding: 0; }
/* -------------- classes for different background styles --------------- */
.bg1 { background: repeat-x; background-color: #c363d8; }
.bg2 { background: repeat-x; background-color: #5b82fb; }
.bg3 { background: repeat-x; background-color: #60cffb; }
.bg4 { background: repeat-x; background-color: #a1fcd6; }
.bg5 { background: repeat-x; background-color: #fdf9a9; }
.bg6 { background: repeat-x; background-color: #fcc088; }
.bg7 { background: repeat-x; background-color: #fc759e; }
/* ---------------------------------------------------------------------- */
.clear, .one, .two, .three, .four, .five, .six, .seven { cursor: pointer; }
ul#icons { position: relative; width: 925px; height: 46px; background: url('https://lh6.googleusercontent.com/-h_6910QHwwY/UBBDreUUVMI/AAAAAAAAC9M/zIrA86dRALI/s925/palette925.png') no-repeat; }
#bg p { position: relative; top: 110px; }
#bg p a { font-size: 10px; padding: 10px; position: absolute; top: 78px; text-decoration: none; color: #070809; }
ul#icons li { position: absolute; list-style: none; }
ul#icons li.seven { left: 0px; width: 900px; height: 46px; }
ul#icons li.six { left: 112px; width: 900px; height: 46px; }
ul#icons li.five { left: 244px; width: 900px; height: 46px; }
ul#icons li.four { left: 376px; width: 900px; height: 46px; }
ul#icons li.three { left: 508px; width: 900px; height: 46px; }
ul#icons li.two { left: 640px; width: 900px; height: 46px; }
ul#icons li.one { left: 766px; width: 900px; height: 46px; }
</style>
<div id="buttons">
<ul id="icons">
<li class="seven"><a href="#"></a></li>
<li class="six"><a href="#"></a></li>
<li class="five"><a href="#"></a></li>
<li class="four"><a href="#"></a></li>
<li class="three"><a href="#"></a></li>
<li class="two"><a href="#"></a></li>
<li class="one"><a href="#"></a></li>
</ul>
</div>
Have a nice night (:
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