Need Help! PLEASE!

ok, another question lol... i downloaded some chipsets, and for some reason when i right click on the map, they do not show up in the proporties... when i dled them, i put them into the rpt folder then into the chipset folder and they are in PNG format...how do i get them to work? #2 lets say my hero is walking down somewhere along a map, and i want him to go into a door, and make him teleport into the house, how do i make that happen apon contact with that square? like when i use the teleport option... i have to press space for it to teleport me...

and also...when my character is walking on the maps...he walks through the trees ect...and houses, how do i make them non-passable?

One other question... i want to make seperate maps... because it seems when my hero goes through the door, i teleported him to the site of the map....and i wanted to make that place, but when i switch the chip sets, it switches the ones i have allready made... so i was wondering can u make seperate maps, and when the hero goes through the door, he teleports to the 2nd map?

can u even use multiple chipsets? on the same map?
i even made a seperate map now and when i change the chipsets it screws with the 1st map's...how can i stop that?