$(function() {
    var s1Height = $('#sidebar1').height();
    var s2Height = $('#sidebar2').height();
    if (s1Height > s2Height) {
        var sHeight = s1Height;
    } else {
        var sHeight = s2Height;
    }
    var cHeight = $('#content').height();
    if (sHeight > cHeight) {
        $('#content').height(sHeight-4);
    }

});