real estate serachable database website

Hi I have a website design and need to have a searchable database on it that has a search form on it and a results page. I also need to have an admin area that company employes can update the database with. There are 2 section...rental and sales so these need to be built and kept seperate. ## Deliverables SO basically i need to have a login area for employees where they can update all the information on new properties add photos relating to those properties...edit and delte them as well. There will be a sales section and a rental section. I would need drop down menus on the search forms and then on the reults page would contain one photo with a small amount of information...the price or rent of property and then how many bedrooms and bathrooms....I would then need it to link to a more information page that owuld house more information about each property...ie..bigger description...more photos that were thumbnails that linked to bigger photos....all this would be generated form the database rather then static pages. it would need to be PC and MAC compatible. ## Platform windows xp and mac i had one build already that used asp.net...but am not sure that this is the best optionor not so am open to ideas if you think it is better.