Create a widget/gadget

I am using Osclass ([login to view URL]) a free opensource classifieds script on my domain: [login to view URL] I require a widget plugin for this script. This is what the widget must look like.(see attached file) anyone that wants to use this widget on their blog/website must be able to get the html/java code from my [login to view URL] widget must be customizeable in other words border thickness, colour,font, size It must work in all browsers for example firefox,IE,CHROME IT must work with blogger.