integer primnum = 0 ; // change to the number of a prim that you want to flash
integer counter = 0;
Off() {
    llSetLinkPrimitiveParamsFast(0,[PRIM_POINT_LIGHT, TRUE, <1,1,1>, 1.0, 10, .1, PRIM_FULLBRIGHT, ALL_SIDES,1, PRIM_GLOW, ALL_SIDES, 1.0]);
}
On() {
    llSetLinkPrimitiveParamsFast(0,[PRIM_POINT_LIGHT, FALSE, <1,1,1>, 1.0, 10, .1, PRIM_FULLBRIGHT, ALL_SIDES,0, PRIM_GLOW, ALL_SIDES, 0.0]);
}
default
{
    state_entry()
    {
        Off();
    }
    touch_start(integer total_number)
    {
        llSetTimerEvent(.1); // 1/10 a second between events
    }
    timer()
    {
        if (counter == 0)
            On();
        else if (counter == 1)
            Off();
        else if (counter == 2)
            On();
        else if (counter == 2) {
            Off();
            llSetTimerEvent(0);
        }
        counter++;
    }
    
}