Rich text editor not working on localhost server

Question

I downloaded the pagedown text editor and theWMD text editor, But they are misbehaving when i try to run them on the localhost server.

When i run it like this it works ok

file:///D:/xampp/htdocs/myfolder/pagedown-master/demo/browser/demo.html

i.e.

But when i run it like this from a localhost server it misbehaves

http://localhost/myfolder/pagedown-master/demo/browser/demo.html

i.e.

How it misbehaves:

• The menu ...wmd-button-bar hides its components and becomes blank
• The page does not stop loading

Its like it has something to do with the css path to the button image file

.wmd-button > span {
background-image: url(../../wmd-buttons.png);.....

Because when i delete the line the page will stop loading but still the buttons header will ofcourse not be there

Any help!