Get / set map image mouse location

Hi. I need to develop asp.net webApplication from scratch without google map Api, that set location on a map image when user selects any location, and set any image map locator on the current location that user has selected it.
More clear, its like google map. I display a map for user and then user selects any location to build his/her house for example, then on mouse leave i set an selector image for that location "like the red arrow on google map", and on Get process of user data i put that image selector on the location user has previously selected. I need any article that could help me on that and tools that can supports me, Thanks.