创建一个“div三明治”与固定高度面包切片div和一个可扩展的肉div

So I have a div sandwich: three divs on top of one another. The slices of bread are both fixed-height due to background images. The meat is a 1px tall vertical repeater image. I need a way to expand the meat when overflow content from the top breadslice hits the bottom of the bottom breadslice. I figured a wrapper would be necessary for the meat and the bottom bread, but I'm not sure how to implement it.So I have a div sandwich: three divs on top of