Adding llGetOwner troubles

I have two scripts that work by touch. I'm trying to add if(llDetectedKey(0) == llGetOwner()) to these, so that only I can control them. Thing is, every time I put it in, I break the scripts. Anyone willing to help me out?

//Simple light switch. Click object with script turns light on and off.

integer light_switch;
vector light_color=< 1,1,1>;
float light_intensity=1.0;
float light_radius=04.0;
float light_falloff=1;


init ()
{

//Set light to off initially
light_switch=0;
llSetPrimitiveParams([ PRIM_GLOW, ALL_SIDES, 0.0,PRIM_POINT_LIGHT, FALSE, light_color, light_intensity, light_radius, light_falloff]);
//llOwnerSay("Set to midnight and click to toggle light!");

}

default
{
state_entry()
{

init();

}

on_rez(integer start_param)
{
init();
}

touch_start(integer total_number)
{
if(light_switch==1) 
{
//Light is on, turn off
llSetPrimitiveParams([ PRIM_GLOW, ALL_SIDES, 0.0,PRIM_POINT_LIGHT, FALSE, light_color, light_intensity, light_radius, light_falloff]);
light_switch=0;
//llOwnerSay("Light turned off.");
}

else
{
//Light is off, turn on
llSetPrimitiveParams([ PRIM_GLOW, ALL_SIDES, 0.25,PRIM_POINT_LIGHT, TRUE, light_color, light_intensity, light_radius, light_falloff]);
light_switch=1;
//llOwnerSay("Light turned on.");
}

}

}

and

vector r_open = <  0.0, 0.0, 90.0>; // This prim's rotations in degrees relative to root prim when this prim is open
vector r_closed = <  0.0, 0.0, 10.0>; // and when it's in the closed state


integer close_on_rez = TRUE; // Change to false to have the prim open on rez

// ================================================== ===== Nothing from here down needs modding.

rotation LocalRot(rotation localrot)
{
rotation LocRot = localrot / ( (ZERO_ROTATION / llGetLocalRot()) * llGetRot());
return LocRot;
}

open(string door)
{
llSetPrimitiveParams([PRIM_ROTATION, LocalRot(llEuler2Rot(r_open * DEG_TO_RAD))]);
}

close(string door)
{
llSetPrimitiveParams([PRIM_ROTATION, LocalRot(llEuler2Rot(r_closed * DEG_TO_RAD))]);
}

default 
{
state_entry()
{
if (close_on_rez)
{
state closed;
}
else
{
state opened;
}
}

on_rez(integer rez)
{
llResetScript();
}
}

state opened
{
state_entry()
{
open("left");
}

on_rez(integer rez)
{
llResetScript();
}

touch_start(integer n)
{
state closed;
}

}

state closed
{
state_entry()
{
close("left");
}

on_rez(integer rez)
{
llResetScript();
}

touch_start(integer n)
{
state opened;
}

}

So, what breaks? You have the syntax right. All you have to do is put bracket after the if statement to surround the code that you want to be affected....

if(llDetectedKey(0) == llGetOwner())
{
//do stuff
}

llDetectedKey will only work in your touch_start events, but that's most of the script anyway.

I put it near the touch calls. When I do, I get a syntax error.

Don't put it near the touch events. Put it in them.
Like so:

touch_start(integer total_number)
{
    if ( llGetOwner() == llDetectedKey(0) )
    {    
        if(light_switch==1) 
        {
            //Light is on, turn off
            llSetPrimitiveParams([ PRIM_GLOW, ALL_SIDES, 0.0,PRIM_POINT_LIGHT, FALSE, light_color, light_intensity, light_radius, light_falloff]);
            light_switch=0;
            //llOwnerSay("Light turned off.");
        }

        else
        {
             //Light is off, turn on
             llSetPrimitiveParams([ PRIM_GLOW, ALL_SIDES, 0.25,PRIM_POINT_LIGHT, TRUE, light_color, light_intensity, light_radius, light_falloff]);
             light_switch=1;
             //llOwnerSay("Light turned on.");
        }
    }
}

Alright, thanks