BTW for anyone that is modifying a skin to work on their site, using firefox with the
User Agent Switcher Extension works a treat. You will need to add a new Mobile UserAgent - once installed, Click Tools, User Agent Swtcher, Options, Options..., then click 'User Agents' on the Left and the Add button. Give it a description of "Mobile" and a User Agent "Mobile" - OK your way out and then you can switch between you default User Agent and a Mobile one and test out your mobile skin
Another tip is to enter the following URL
javascript:resizeTo(340,420); which will resize your browser window to a similar size as a PDA - you need to add extra height and width for the toolbars and frames etc that are in Firefox - but it gives you a good idea of how things will look on a mobile device