version 0.1full styling
the combobox() function takes an optional options parameter and can be set like this
html (click to view/hide)
<head>
<title>jquery.combox example</title>
<script type="text/javascript" src="Scripts/jquery.js"></script>
<script type="text/javascript" src="Scripts/jquery.dimensions.js"></script>
<script type="text/javascript" src="Scripts/jquery.combobox.js"></script>
</head>
<body>
<select id="officeItemList">
<option value="1">eraser</option>
<option value="3">pencil</option>
<option value="4">ruler</option>
<option value="5">ink</option>
<optgroup label="paper types">
<option value="7">A4 paper</option>
<option value="8">A3 paper</option>
<option value="9">letter-sized paper</option>
</optgroup>
<optgroup label="chair types">
<option value="10">executive</option>
<option value="11">janitor</option>
<option value="12">developer</option>
</optgroup>
</select>
</body>
script:
$('#officeItemList').combobox(
{
comboboxContainerClass: "comboboxContainer",
comboboxValueContainerClass: "comboboxValueContainer",
comboboxValueContentClass: "comboboxValueContent",
comboboxDropDownClass: "comboboxDropDownContainer",
comboboxDropDownButtonClass: "comboboxDropDownButton",
comboboxDropDownItemClass: "comboboxItem",
comboboxDropDownItemHoverClass: "comboboxItemHover",
comboboxDropDownGroupItemHeaderClass: "comboboxGroupItemHeader",
comboboxDropDownGroupItemContainerClass: "comboboxGroupItemContainer",
animationType: "fade",
width: "150px"
});
css (click to view/hide)
body
{
font-family: Verdana;
font-size: small;
}
.comboboxContainer
{
border-left: solid 2px #777;
border-top: solid 2px #777;
border-right: solid 1px #ccc;
border-bottom: solid 1px #ccc;
}
.comboboxValueContainer
{
background: url(/images/comboboxDisplayValue.gif) repeat-x left top;
}
.comboboxValueContent
{
padding-left: 3px;
text-transform: uppercase;
}
.comboboxDropDownContainer
{
border-right: solid 1px #000;
border-bottom: solid 1px #000;
border-left: solid 1px #aaa;
border-top: solid 1px #aaa;
background: #fff;
overflow: hidden;
padding-left: 3px;
cursor: default;
}
.comboboxDropDownButton
{
width: 16px;
height: 18px;
background-image: url(/images/default-combobox.gif);
}
.comboboxGroupItemHeader
{
display: block;
background: #000;
color: #fff;
}
.comboboxGroupItemContainer
{
padding-left: 10px;
}
.comboboxItem
{
background: #fff;
color: #000;
text-transform: lowercase;
font-weight: normal;
font-style: normal;
}
.comboboxItemHover
{
background-color: #999;
color: #fff;
text-transform: uppercase;
padding-left: 4px;
}
The css classes attempt to render the combox to look like the standard
combox found in Windows. The major difference is in the dropdown button
which is an image 
, whereas the basic jquery.combobox uses border styling and a special character '▼' to render the button
live example
note: styles will differ with the default as this site imposes its own styles