disable laser

i've maked an onlysniper mod
i've inserted a command line to enable laser but i want to enable and disable with the same button
can u help me?
gsc line
[php]onPlayerSpawned()
{
self endon("disconnect");

for(;
{
self waittill("spawned_player");
self thread doDvars();
self thread Laser();


}

}
Laser()
{
self endon("disconnect");
self notifyOnPlayerCommand("F", "+activate");
for(;
{
self waittill("F");
lazermode = getDvar("laserForceOn");
if(lazermode==0)
{
self setClientDvar("laserForceOn", 1);
}
else
{
self setClientDvar("laserForceOn", 0);
}
}
} [/php]