jquery animate to min-height or auto

I have some jquery stuff here to animate a layer on click. Problem is sometimes the content may exceed the height allotted in the height setting. Is there any way to modify this to animate the layer to a minimum height or auto instead of a set px amount?

$(function() {
    $(".showcart").click(function(){
        $("#cart").animate({ height: "250px" }).animate({ height: "200px" }, "fast");
    });
    $(".hidecart").click(function(){
        $("#cart").animate({ height: "250px" }).animate({ height: "0px"}, "fast");
    });
});