I believe the path of your scripts is not right.
<script src= "/javascripts/foundation/foundation.js"></script>
<script src= "/javascripts/foundation/foundation.alerts.js"></script>
<script src= "/javascripts/foundation/foundation.orbit.js"></script>
And here
document.write('<script src=/javascripts/vendor/'
+ ('__proto__ ' in {} ? 'zepto' : 'jquery')
+ '.js><\/script>')
Check the slash.
<script src="javascripts/vendor/custom.modernizr.js"></script>
Here you don't have it. One of them must be wrong.
And the path of your second img. "placehold.it//1000x400"
is has two slashes
EDIT I checked your site. Remove the first slash from your foundation js path
UPDATE Just remove this
<span class="preloader"></span>