Printing Page Help - CSS/DIV

Hi - I have a page I would like to print but currently when printing the whole page is blank.

I have a div called WharehouseMap that has uses a background image to display a map.  Within that div is another div called  WWA that has a background color of red.  I would like both the map and the WWA div with the red background to showup on the printout.

How can I do this?

CSS
---------------------------------------------

div#WarehouseMap
{
    position: relative;
    background-image: url('Warehouse_Floor_Plan.jpg');
    background-repeat: no-repeat;
    height: 600px;
    width: 681px;
}

div#WWA
{
    position: absolute;
    height: 48px;
    width: 17px;
    left: 116px;
    top: 495px;
    background-color: #FF0000;  /*  RED  */
}


ASPX PAGE
---------------------------------------------

<div id="WarehouseMap">
    <div id="WWA" runat="server"></div>
</div>

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