Toggling timer event

I am trying to start and stop a timer event via chat. I am not a skilled scripter, mostly what I do is to cobble together working scripts by hacking up old ones, and this one has me stumped.

Probably an easy fix for someone who knows what they are doing, but I've spent hours researching it, and this is as close as I've been able to get. Of course, I get a syntax error at the second "if."

[CODE}

integer train;
default
{
state_entry()
{

llListen(3, "", "","train on";
llListen(3, "", "","train off";
}

listen(integer channel, string name, key id, string m)
{
if (m == "train on"
llSetTimerEvent(1);
}

timer()
{
llSay(5,"One";
llSleep (.3);
llSay(5,"Two";
llSleep (.3);
llSay(5,"Three";
llSleep (.3);
llSay(5,"Four";
llSleep (.3);
}

if (m == "train off"
{
llSetTimerEvent(0);
}
}
}
}
[CODE}

See if this works.
[CODE}

integer train;
default
{
state_entry()
{

llListen(3, "", "","train on";
llListen(3, "", "","train off";
}

listen(integer channel, string name, key id, string m)
{
if (m == "train on"
llSetTimerEvent(1);
}

timer()
{
llSay(5,"One";
llSleep (.3); //sleeps ignore all events so you will not be able to issue the timer off commands until this section it complete. if you want to interupt the count use .3 timer and counter
llSay(5,"Two";
llSleep (.3);
llSay(5,"Three";
llSleep (.3);
llSay(5,"Four";
llSleep (.3);
// take out this bracket }

if (m == "train off"
{ //optional for one line if's
llSetTimerEvent(0);
} //optionals
}
}
// this is an extra braket }
[CODE}[/QUOTE]

Thanks Destiny,

Still getting a syntax error, but this time it moved from in front of the "if" to in front of the next "==" (in the off command)

That is because the string "m" just exist in the listen event

listen(integer channel, string name, key id, string m)

Works! Thanks!