var openSpeed = 40;
var openTotalHeight = 130;
var openToNewHeight = 0;

function openIt(direction){
  if(direction == 'up'){
    divSpeed = openSpeed * -1;
  } else {
    divSpeed = openSpeed;
  }
  
  moveDiv = document.getElementById('divSubMenu');
  openToNewHeight = openToNewHeight + divSpeed;
    
  if(openToNewHeight >= openTotalHeight){
    openToNewHeight = openTotalHeight;
    clearInterval(stopIt);
  }
  if(openToNewHeight < 0){
    openToNewHeight = 0;
    clearInterval(stopIt);
  }  
  moveDiv.style.height = openToNewHeight+"px";
}

function resizeDiv(direction){
  divDirection = direction;
  if((openToNewHeight == 130 && direction == "up") || (openToNewHeight == 0 && direction == "down" )){
    stopIt = setInterval("openIt(divDirection)", 10);
  }
}