flying trigger

hi there could someone tell me what should i do to make a particle script trigger on when i make my avatar fly and off when i'm not flying thanks

Try this (Didn't tested it):

integer isFlying = FALSE;

default
{
state_entry()
{
llSetTimerEvent(3.0);
}

timer()
{
if (llGetAgentInfo(llGetOwner()) & AGENT_FLYING)
{
if(isFlying == FALSE)
{
isFlying = TRUE;

//
// PARTICLE START TRIGGER HERE
//
}
}
else
{
if(isFlying == TRUE)
{
isFlying = FALSE;

//
// PARTICLE STOP TRIGGER HERE
//
}
}
}
}