ASP.NET Programmatically assign CSS ID to a <div>

I have a sample ASPX page with a few styles assigned (see code below)
Styles were created in VS2008

1)  I want to programmatically (using VB) add a DIV in the page and want the freedom of using a choice of the EXISTING styles currently defined in the style section of the aspx page, without having to recode the styles - some code examples will be appreciated.

2) Is it possible to place a general div in the aspx page and change its id programmatically - although I suppose this is possible ? - but rather to use a placeholder ?

Any suggestiions welcome

Thanks

Cassie

Part of ASPX page......
 
<style type="text/css">
        #div01
        {
            background-color: #FFFFCC;
            width: 200px;
            height: auto;
        }
        .teststyle01
        {
            background-color: #99CCFF;
            width: 500px;
            height: 200px;
        }
        #divtop
        {
            background-color: #66FF33;
            width: 500px;
            height: 200px;
        }
    </style>

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