Permission for use of Logo for article

Hi, My name is Rajesh and I work for the Division of Computing and Information Technology (DCIT) department at Clemson University, Clemson, South Carolina. We have a free monthly online newsletter named "Faculty Directions", for faculty of Clemson University, in which we have articles of faculty interest, under various categories. We had one main article on PHP for the September issue. Since we have a photo accompanying the main article, we felt that the PHP logo, probably hyperlinked to your home page, would be best suited for the article. I found the php.gif file on your homepage but would like to have your permission before we go ahead and use it. I'd also appreciate if you could allow us to proportionately resize the logo (probably enlarge), or specify a link where we could get a larger logo. Thanks in advance, Rajesh