function resizeStage(){
	var viewport = document.viewport.getDimensions();
	$("middle").setStyle({ "height": "auto" });
	cHeight = viewport.height;
	cHeight -= $("head").getHeight();
	cHeight -= $("footer").getHeight();
	if(viewport.height > $("stage").getHeight()){
		$("middle").setStyle({ "height": cHeight+"px" });
	}
}

document.observe("dom:loaded", function(){
	$$("body")[0].addClassName("jsEnabled");

	resizeStage();
	Event.observe(document.onresize?document:window, "resize", function(){
		resizeStage();
	});
});