Code for a spacebar fly hack!??

Quick q. I want it so when the player presses nub4 it start the hack so when they press spacebar they can fly but when they turn it off with nub 4 they press spacebar and jump. Here is the script what did I do wrong? (bool hack = false; is higher up in the script)

[php]if(GetAsyncKeyState(VK_NUMPAD4) < 0){ //Fly
if( hack == false ){
if( GetAsyncKeyState(VK_SPACE) < 0 )
{
ConsolePush( "PlayerGravity 800" );
}else{
ConsolePush( "PlayerGravity -800" );
}

hack = true;
} else {
hack = false;
}
Sleep(200);
}[/php]

All my other simple on/off hacks work just fine.

try this instead
[php]if(GetAsyncKeyState(VK_INSERT) < 0){
if(fly==false){
fly=true;
}else{
fly=false;
}
}
if( fly == true ){
if(GetAsyncKeyState(VK_SPACE) < 0 ){
ConsolePush( "PlayerGravity 800" );
}else{
ConsolePush( "PlayerGravity -800" );
}
}else{
ConsolePush( "PlayerGravity -800" );
}[/php]