function js_rand( min, max ) {
  
  if( min > max ) {
    return( -1 );
  }
  
  if( min == max ) {
    return( min );
  }
  
  return( parseInt(min) + parseInt( Math.random() * ( parseInt(max) - parseInt(min) + 1 ) ));

}


function js_parable(a, b, c){
  
  a = Math.pow(a, 2);
  return (a + (a*b) + c);
}


function js_acceleration(distance, angle){
  
  // Wandle Grad in Bogenmaß
  var rad = (angle*Math.PI/180);
  // Bewege Objekt
  return Math.sin(rad)*distance;

}

function js_convertPercentage(percent, max){
  return ((max / 100) * percent);

}