fix the terrible calc chat ui

bookmarklet.js

javascript:(function(){var a=loadSolution,b=!1,c=function(){b||(b=$("#loader-img")),b.show()},d=function(){b.hide()};loadSolution=function(){c(),a.apply(null,arguments)},$("#book-content-center,#book-content-right,#bottom-toolbar").remove(),$("#left-content-container,#book-content-left").css({width:"auto",height:"auto","float":"none",display:"block",overflow:"visible"}),$("<button>Next Problem</button>").click(function(){return $("#selExercises")[0].selectedIndex++,loadSolution(),!1}).appendTo($("#toolbar")),$("<button>Previous Problem</button>").click(function(){return $("#selExercises")[0].selectedIndex--,loadSolution(),!1}).appendTo($("#toolbar")),$("<span></span>").attr("id","loader-img").html(" &nbsp;&nbsp;Loading...").hide().appendTo($("#toolbar")),$("#solutionimg").load(d)})()

source.js

(function () {
	var old = loadSolution
		, loader = false
		, showLoader = function () {
			if(!loader) {
				loader = $('#loader-img');
			}
			loader.show();
		}
		, hideLoader = function () {
			loader.hide();
		};
	loadSolution = function () {
		showLoader();
		old.apply(null, arguments);
	};
	
	$('#book-content-center,#book-content-right,#bottom-toolbar').remove();
	$('#left-content-container,#book-content-left').css({width:'auto',height:'auto',float:'none',display:'block',overflow:'visible'});
	$('<button>Next Problem</button>').click(function () {
		$('#selExercises')[0].selectedIndex++;
		loadSolution();
		return false;
	}).appendTo($('#toolbar'));
	$('<button>Previous Problem</button>').click(function () {
		$('#selExercises')[0].selectedIndex--;
		loadSolution();
		return false;
	}).appendTo($('#toolbar'));
	$('<span></span>')
		.attr('id', 'loader-img')
		.html(" &nbsp;&nbsp;Loading...")
		.hide()
		.appendTo($('#toolbar'));
	$('#solutionimg').load(hideLoader);
})()