It looks to me like you are specifying the path to the UDM4 files incorrectly. For example, the path to your stylesheet:
Code:
href="/udm4-php/udm-resources/udm-style.php"
According to the above code, the folder named udm4-php is directly under the root folder for the website. Is that where it really is? If not, you'll also need to fix the value of the $config variable in that same file.