Simple Google Maps addition

I have a simple existing Google maps page that pulls data in from an xml file. It currently displays a number of different colour markers that correspond to different types of properties. As you move your mouse over each marker the info window pops up with the property name. The xml file currently contains only four elements: long - lat - title - icon. I would like to add 2 elements to the xml file ( url and info ) and then have the javascript modified to incorporate this on the Google Map, so that you move your mouse over the marker and the infowindow displays title and my new " info " and if you click the marker at that point it takes you to a new " url ". I would also like to style the infowindow as well. I'm sure it's a very simple job and anyone with any Google Maps experience could do this in about 10 mins max. I'll upload the files so you can see the html page and the xml file.