onclick="viewfile('../assets/arrow_down.gif')
onclick="viewfile('..%2Fassets%2Farrow_down.gif')
onclick="viewfile(\''.urlencode($webstart_path.substr($newpath, $len, strlen($newpath))).'\');
onclick="viewfile(\''.$webstart_path.substr($newpath, $len, strlen($newpath)).'\');
onclick=\"viewfile('$webstart_path".substr($newpath, $len, strlen($newpath))."');
For example mine are:
Resource URL: assets/
Resource Path: assets/
File Manager Path: = D:/Domains/onesmarthost.co.uk/wwwroot