Changing URLs from Relative to Absolute

Dear list, I was recently trying to write a script where a user copy and pastes their HTML code to display something on a listings site and tried to find a way to change the URL of an image from relative to absolute. For example <img src="images/1.jpg"> becomes <img = src=" http://domain.com/images/1.jpg">. That is easy enough and I created a regexp, but I found that some people call the img tag differently such as: <img a="A photo" src="images/1.jpg"> Does anyone have experience of this? How can I create a regexp that will find it in every case? Thanks in advance. Tom -- Tom Chubb tomchubb@gmail.com