How do i control a div tag in ASP.NET?

I have a div tag on my aspx page like this:

<div id="somespacer" class="spacer1" runat="server"></div>

I want to change the class programmatically in the code-behind so it will be rendered like this:

<div id="somespacer" class="spacer2" runat="server"></div>

How do I take a hold of the div tag and change the CssClass for it?
Who is Participating?
pkumarraConnect With a Mentor Commented:
You can do this

the_bachelorConnect With a Mentor Commented:
since the div tag is not  a server control, u'll have to use client script to access it, hence the javascript code from pkumarra.

Now you can use code behing to manipulate when the client script gets generated or executed.
Use ASP.Net Panel control for this.
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