iframe in PHP does not work : 
The following code in a PHP script used to work. But now it does not work any more. I tried with the URL directly and it works well. I replaced the URL with something else it works too. I could not figure out what could go wrong. Any ideas? thanks.


<iframe
                        src="http://www.pathwaycommons.org/pc/webservice.do?version=3.0&q=TP53&format=html&cmd=get_by_keyword&snapshot_id=GLOBAL_FILTER_SETTINGS&record_type=PATHWAY"
                        WIDTH="100%"
                        HEIGHT="600"
                        MARGINWIDTH=0
                        MARGINHEIGHT=0
                        FRAMEBORDER="NO"
                        SCROLLING="AUTO"
                    ></iframe>
