String manipulation with ereg_replace

I am working on a site that has over 1000 pages and all the images need to be made lower case in the HTML. Here is what I have so far. Please someone tell me what I am doing wrong. $contents="<img src=ThisOneReallyNeedsToBeAllLowercase.gif alt=ThisOneReallyNeedsToBeAllLowercase.gif>"; $contents = EREG_REPLACE("([-_a-zA-Z0-9]+).gif",strtolower("\\0"),$contents); Output of $contents needs to equal <img src=thisonereallyneedstobealllowercase.gif alt=thisonereallyneedstobealllowercase.gif> I have the top part of my script reading the whole DIR and only editing the HTML files so that part is taken care of All I need it help with making the images tag all lower case. Regards, Ian LeBlanc Web Development Rask, Inc. - www.rask.com Phone: (727) 517-2000 Fax: (727) 517-2001