You page link seems to be broken. The error you are getting about the headers already being sent is almost always due to some white space characters outside of the php blocks that are interpreted as output.
Since the error says the output is occurring on line 1 of your contact.php this is the page that you should check for issues. Look for a space or return that is outside of the php block at the top of the page.
I have seen before where having the BOM signature on the page causes this error to occur. You can check on this setting by doing a save as for the file, in the save as dialog box there should be a check box for the option of including the BOM signature on the page. You should make sure that this option is not enabled.