Set window min / max height on resize

setWindowMinMaxDimensions.js

(function(){
  window.setWindowMinMaxDimensions = function(){
    var min_height  = 680;
    var max_height  = '100%';
    var min_width   = 950;
    var max_width   = 'auto';
    window.onresize = function() {
        var height = document.documentElement.clientHeight;
        if (height < min_height) {
            document.body.style.height = min_height + 'px';
        } else {
            document.body.style.height = max_height;
        }
        var width = document.documentElement.clientWidth;
        if (width < min_width) {
            document.body.style.width = min_width + 'px';
        } else {
            document.body.style.width = max_width;
        }
    };
  };
  setWindowMinMaxDimensions();
});