Display images from an XML file using PHP

Write a PHP script with comments, The script obtains an external XML file and loads it up using PHP, the contents of the xml file are then displayed on our end, specifically the <img> tag. The problem with the external xml is that it doesn't allow to be loaded on my end, perhaps one of you can figure it out because i continue to get: I/O warning : failed to load external entity, however using a different xml file from another host it works. The php script will display every image found on the xml file, the xml url varies so it needs to be able to grab the file with a variable. This is a very small simple project, it should take less than one hour's work for an experienced programmer.