Set Image to be Background of a div Element

I currently have a website wherby I upload an image to my database

My code then retrieves this image and sets the asp image to the url of that image:

imageProductDetail.ImageUrl = "ImageViewer.ashx?ImageID=" + getProduct.Product.ImageID.ToString();

<asp:Image ID="imageProductDetail" runat="server" CssClass="asp_image"  />

This works fine, but What I would like to do instead is create a div called imageProductDetail and then set the css background of that div to be the image url

Is this possible? ...