Format the currency of this budget for real

        /* Shivving (IE8 is not supported, but at least it won't look as awful)
        /* ========================================================================== */

        (function (document) {
        	var
        	head = document.head = document.getElementsByTagName('head')[0] || document.documentElement,
        	elements = 'article aside audio bdi canvas data datalist details figcaption figure footer header hgroup mark meter nav output picture progress section summary time video x'.split(' '),
        	elementsLength = elements.length,
        	elementsIndex = 0,
        	element;

        	while (elementsIndex < elementsLength) {
        		element = document.createElement(elements[++elementsIndex]);
        	}

        	element.innerHTML = 'x<style>' +
        		'article,aside,details,figcaption,figure,footer,header,hgroup,nav,section{display:block}' +
        		'audio[controls],canvas,video{display:inline-block}' +
        		'[hidden],audio{display:none}' +
        		'mark{background:#FF0;color:#000}' +
        	'</style>';

        	return head.insertBefore(element.lastChild, head.firstChild);
        })(document);

        /* Prototyping
        /* ========================================================================== */

        (function (window, ElementPrototype, ArrayPrototype, polyfill) {
        	function NodeList() { [polyfill] }
        	NodeList.prototype.length = ArrayPrototype.length;

        	ElementPrototype.matchesSelector = ElementPrototype.matchesSelector ||
        	ElementPrototype.mozMatchesSelector ||
        	ElementPrototype.msMatchesSelector ||
        	ElementPrototype.oMatchesSelector ||
        	ElementPrototype.webkitMatchesSelector ||
        	function matchesSelector(selector) {
        		return ArrayPrototype.indexOf.call(this.parentNode.querySelectorAll(selector), this) > -1;
        	};

        	ElementPrototype.ancestorQuerySelectorAll = ElementPrototype.ancestorQuerySelectorAll ||
        	ElementPrototype.mozAncestorQuerySelectorAll ||
        	ElementPrototype.msAncestorQuerySelectorAll ||
        	ElementPrototype.oAncestorQuerySelectorAll ||
        	ElementPrototype.webkitAncestorQuerySelectorAll ||
        	function ancestorQuerySelectorAll(selector) {
        		for (var cite = this, newNodeList = new NodeList; cite = cite.parentElement;) {
        			if (cite.matchesSelector(selector)) ArrayPrototype.push.call(newNodeList, cite);
        		}

        		return newNodeList;
        	};

        	ElementPrototype.ancestorQuerySelector = ElementPrototype.ancestorQuerySelector ||
        	ElementPrototype.mozAncestorQuerySelector ||
        	ElementPrototype.msAncestorQuerySelector ||
        	ElementPrototype.oAncestorQuerySelector ||
        	ElementPrototype.webkitAncestorQuerySelector ||
        	function ancestorQuerySelector(selector) {
        		return this.ancestorQuerySelectorAll(selector)[0] || null;
        	};
        })(this, Element.prototype, Array.prototype);

        /* Helper Functions
        /* ========================================================================== */

        function generateTableRow() {
        	var emptyColumn = document.createElement('tr');

        	emptyColumn.innerHTML = '<td><a class="cut">-</a><span contenteditable></span></td>' +
        		'<td><span contenteditable></span></td>' +
        		'<td><span data-prefix>$</span><span contenteditable>0.00</span></td>' +
        		'<td><span contenteditable>0</span></td>' +
        		'<td><span data-prefix>$</span><span>0.00</span></td>';

        	return emptyColumn;
        }

        function parseFloatHTML(element) {
        	return parseInt( element.innerHTML.replace(/[\D]+/g,'') );
        }
        

        function parsePrice(number) {
        
               var result=number+"";
               result = result.replace(/([0-9]{2})$/g, ",$1");
              if( result.length > 6 )
              result = result.replace(/([0-9]{3}),([0-9]{2}$)/g, ".$1,$2");

             return result;

        }
        

        /* Update Number
        /* ========================================================================== */

        function updateNumber(e) {
        	var
        	activeElement = document.activeElement,
        	value = parseFloat(activeElement.innerHTML),
        	wasPrice = activeElement.innerHTML == parsePrice(parseFloatHTML(activeElement));

        	if (!isNaN(value) && (e.keyCode == 38 || e.keyCode == 40 || e.wheelDeltaY)) {
        		e.preventDefault();

        		value += e.keyCode == 38 ? 1 : e.keyCode == 40 ? -1 : Math.round(e.wheelDelta * 0.025);
        		value = Math.max(value, 0);

        		activeElement.innerHTML = wasPrice ? parsePrice(value) : value;
        	}

        	updateInvoice();
        }

        /* Update Invoice
        /* ========================================================================== */

        function updateInvoice() {
        	var total = 0;
        	var cells, price, total, a, i;

        	// update inventory cells
        	// ======================

        	for (var a = document.querySelectorAll('table.inventory tbody tr'), i = 0; a[i]; ++i) {
        		// get inventory row cells
        		cells = a[i].querySelectorAll('span:last-child');

        		// set price as cell[2] * cell[3]
        		price = parseFloatHTML(cells[2]) * parseFloatHTML(cells[3]);

        		// add price to total
        		total += price;

        		// set row total
        		cells[4].innerHTML = price;
        	}

        	// update balance cells
        	// ====================

        	// get balance cells
        	cells = document.querySelectorAll('table.balance td:last-child span:last-child');

        	// set total
        	cells[0].innerHTML = total;

        	// set balance and meta balance
        	cells[2].innerHTML = document.querySelector('table.meta tr:last-child td:last-child span:last-child').innerHTML = parsePrice(total - parseFloatHTML(cells[1]));

        	// update prefix formatting
        	// ========================

        	//var prefix = document.querySelector('#prefix').innerHTML;
        	for (a = document.querySelectorAll('[data-prefix]'), i = 0; a[i]; ++i) a[i].innerHTML = "R$";

        	document.getElementById("prefix").innerHTML =  "R$";

        	// update price formatting
        	// =======================

        	for (a = document.querySelectorAll('span[data-prefix] + span'), i = 0; a[i]; ++i) if (document.activeElement != a[i]) a[i].innerHTML = parsePrice(parseFloatHTML(a[i]));
        }

        /* On Content Load
        /* ========================================================================== */

        function onContentLoad() {
        	updateInvoice();

        	var
        	input = document.querySelector('input'),
        	image = document.querySelector('img');

        	function onClick(e) {
        		var element = e.target.querySelector('[contenteditable]'), row;

        		element && e.target != document.documentElement && e.target != document.body && element.focus();

        		if (e.target.matchesSelector('.add')) {
        			document.querySelector('table.inventory tbody').appendChild(generateTableRow());
        		}
        		else if (e.target.className == 'cut') {
        			row = e.target.ancestorQuerySelector('tr');

        			row.parentNode.removeChild(row);
        		}

        		updateInvoice();
        	}

        	function onEnterCancel(e) {
        		e.preventDefault();

        		image.classList.add('hover');
        	}

        	function onLeaveCancel(e) {
        		e.preventDefault();

        		image.classList.remove('hover');
        	}

        	function onFileInput(e) {
        		image.classList.remove('hover');

        		var
        		reader = new FileReader(),
        		files = e.dataTransfer ? e.dataTransfer.files : e.target.files,
        		i = 0;

        		reader.onload = onFileLoad;

        		while (files[i]) reader.readAsDataURL(files[i++]);
        	}

        	function onFileLoad(e) {
        		var data = e.target.result;

        		image.src = data;
        	}

        	if (window.addEventListener) {
        		document.addEventListener('click', onClick);

        		document.addEventListener('mousewheel', updateNumber);
        		document.addEventListener('keydown', updateNumber);

        		document.addEventListener('keydown', updateInvoice);
        		document.addEventListener('keyup', updateInvoice);

        		input.addEventListener('focus', onEnterCancel);
        		input.addEventListener('mouseover', onEnterCancel);
        		input.addEventListener('dragover', onEnterCancel);
        		input.addEventListener('dragenter', onEnterCancel);

        		input.addEventListener('blur', onLeaveCancel);
        		input.addEventListener('dragleave', onLeaveCancel);
        		input.addEventListener('mouseout', onLeaveCancel);

        		input.addEventListener('drop', onFileInput);
        		input.addEventListener('change', onFileInput);
        	}
        }

        window.addEventListener && document.addEventListener('DOMContentLoaded', onContentLoad);

    <html>
    	<head>
    		<meta charset="utf-8">
    		<title>Invoice</title>
    		<link rel="stylesheet" href="style.css">
    		<link rel="license" href="https://www.opensource.org/licenses/mit-license/">
    		<script src="script.js"></script>
    	</head>
    	<body>
    		<header>
    			<h1>Invoice</h1>
    			<address contenteditable>
    				<p>Jonathan Neal</p>
    				<p>101 E. Chapman Ave<br>Orange, CA 92866</p>
    				<p>(0800) 555-1234</p>
    			</address>
    			<span><img alt="" src="http://www.jonathantneal.com/examples/invoice/logo.png"><inputtype="file" accept="image/*"></span>
    		</header>
    		<article>
    			<h1>Recipient</h1>
    			<address contenteditable>
    				<p>Some Company<br>c/o Some Guy</p>
    			</address>
    			<table class="meta">
    				<tr>
    					<th><span contenteditable>Invoice #</span></th>
    					<td><span contenteditable>101138</span></td>
    				</tr>
    				<tr>
    					<th><span contenteditable>Date</span></th>
    					<td><span contenteditable>January 1, 2012</span></td>
    				</tr>
    				<tr>
    					<th><span contenteditable>Amount Due</span></th>
    					<td><span id="prefix" contenteditable>$</span><span>600.00</span></td>
    				</tr>
    			</table>
    			<table class="inventory">
    				<thead>
    					<tr>
    						<th><span contenteditable>Item</span></th>
    						<th><span contenteditable>Description</span></th>
    						<th><span contenteditable>Rate</span></th>
    						<th><span contenteditable>Quantity</span></th>
    						<th><span contenteditable>Price</span></th>
    					</tr>
    				</thead>
    				<tbody>
    					<tr>
    						<td><a class="cut">-</a><span contenteditable>Front End Consultation</span></td>
    						<td><span contenteditable>Experience Review</span></td>
    						<td><span data-prefix>$</span><span contenteditable>150000.00</span></td>
    						<td><span contenteditable>4</span></td>
    						<td><span data-prefix>$</span><span>600.00</span></td>
    					</tr>
    				</tbody>
    			</table>
    			<a class="add">+</a>
    			<table class="balance">
    				<tr>
    					<th><span contenteditable>Total</span></th>
    					<td><span data-prefix>$</span><span>600.00</span></td>
    				</tr>
    				<tr>
    					<th><span contenteditable>Amount Paid</span></th>
    					<td><span data-prefix>$</span><span contenteditable>0.00</span></td>
    				</tr>
    				<tr>
    					<th><span contenteditable>Balance Due</span></th>
    					<td><span data-prefix>$</span><span>600.00</span></td>
    				</tr>
    			</table>
    		</article>
    		<aside>
    			<h1><span contenteditable>Additional Notes</span></h1>
    			<div contenteditable>
    				<p>A finance charge of 1.5% will be made on unpaid balances after 30 days.</p>
    			</div>
    		</aside>
    	</body>
    </html>