Billowing Smoke Effect

onSelfEvent (load) {
    /*
    Billowing Smoke Effect
    Swishmax 4 
    By Craig Lowe
    http://www.loweonline.co.uk
    */
    amount=90; // amount of smoke plumes (density)
    spread=40; // how wide the smoke is
    maxSpeed=9; // how fast the smoke travels
    size=45 // size of the smoke plume out of 100
    wind=-2; // wind strength and direction
    rotation=-70; // direction of the smoke plumes out of 360°