Logo not displaying

Hi, this should be really easy but it doesn't want to work lol. The site is www.wanninvestments.com I have tried uploading the logo that I want via a File Manager through my host, I have then selected that file through the Template Manager in Joomla, when I have a look at the site though it just shows the old logo. I then renamed the logo that I uploaded to logo3.png and changed the default one to logo3_old.png and then viewed it and it just shows up as a broken image. I can download the file from the host and view the file like normal though so the picture seems to be ok. I then tried deleting my logo and uploaded it again but named it logo3.png before I uploaded it, in case the File Manager did something to it when I renamed it but I have the same result as before. I have created the file using CS5, I attached it so you can check it. Thanks :)

When I browse:

I get:

so set CHMOD of that file or better it's folder to 755. CHMOD can be changed from cpanel file nanager

Great thanks for your help, the host isn't using cpanel but I found an area where it said that the "world" group didn't have read access. Changed that and everything works properly now. I checked the folder and the permissions seem ok so I will keep an eye on any more files I upload via File Manager.