Hi Lewis, This sort of menu can be created by using the Superfish plugin. Have a look the example at: http://users.tpg.com.au/j_birch/plugins/superfish/all-horizontal-example/ and then read up about the features at http://users.tpg.com.au/j_birch/plugins/superfish/ . You can take everything from that example and alter the css file in order to make it look how you want. I'm sure it will work fine with image replacement too, if that is what you need to do.
Just another option for you. Joel Birch.
