I have the following page structure
<div id ="site-wrapper">
<div id ="banner">
<div id="menu">
<center>Menu Goes Here</center>
</div>
</div>
<div id="content">
<center>Content Goes here</center>
</div>
<div id="sidebar_r">
<center>Right sidebar</center>
<div id="sidebar_top">
Sidebar top
</div>
<div id="sidebar_middle">
Sidebar middle
</div>
<div id="sidebar_bottom">
Sidebar bottom
</div>
</div>
</div>
How do i structure the css . I have used ids for all of the divs is there a better way to do it?