Need help Sensor Script

I need some help on a sensor. I want a prim to be able to when it bumps into something, know what the name of that is or something like that. Here's what I have so far. I'm new with sensors so it could all be wrong.

key player;

default
{
on_rez(integer start_params)
{
player = llGetOwner();
llInstantMessage(player, "Suit loaded";
llRequestPermissions(player, PERMISSION_TAKE_CONTROLS);
}

state_entry()
{
}

control(key id, integer level, integer edge)
{
if (id == player)
{
llSensor("", NULL_KEY, SCRIPTED, 10, PI / 4);
}
}

sensor(integer detected)
{
llWhisper(0, "" + (string) detected + "";
}

touch_start(integer total_number)
{
llSay(0, "Touched.";
}
}

this is for object to object interactions, not avatars, however an avatar wears the object with this script on it.

collision_start(integer detected)
{
if ( llDetectedName(0) == "Ladder";
{
llWhisper(0, "ladder";
llSetPos(<2.0,2.0,2.0>;
}
}

I want it to move the object up when it comes in contact with an object named ladder

If you're using this script in an attachment, you need to do something like this....

collision_start(integer detected)
{
  if ( llDetectedName(0) == "Ladder");
  {
    llWhisper(0, "ladder");
    llMoveToTarget(llGetPos() + <0, 0, 5>, 1.0);
    llSleep(1.0);
    llStopMoveToTarget();
  }
}

Granted this is some really really basic code, and you would probably want to use at_target(), but this should get you going down the right path.

McW