var DDSPEED = 10;
var DDTIMER = 15;
var OFFSET = -2;
var ZINT = 100;

function ddMenu(id,d){
//  var h = document.getElementById(id + 'ddheader');
//  var c = document.getElementById(id + 'ddcontent');
//  clearInterval(c.timer);
//  if(d == 1){
//    clearTimeout(h.timer);
//    c.style.display = 'block';
//    if(c.maxh && c.maxh <= c.offsetHeight){return}
//    else if(!c.maxh){
//      // update 2009-06-03 add by jdkbean
//      c.style.left = (h.offsetWidth + OFFSET) + 'px';   // right
//      //c.style.left = (h.offsetLeft-c.offsetWidth ) + 'px'; // left
//      c.style.height = 'auto';
//      c.maxh = c.offsetHeight;
//      c.style.height = '0px';
//    }
//    ZINT = ZINT + 1;
//    c.style.zIndex = ZINT;
//    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
//  }else{
//    h.timer = setTimeout(function(){ddCollapse(c)},50);
//  }
 document.getElementById(id + 'ddcontent').style.display='none';
}

function ddCollapse(c){
  c.timer = setInterval(function(){ddSlide(c,-1)},DDTIMER);
}

function cancelHide(id){
//  var h = document.getElementById(id + 'ddheader');
//  var c = document.getElementById(id + 'ddcontent');
//  clearTimeout(h.timer);
//  clearInterval(c.timer);
//  if(c.offsetHeight < c.maxh){
//    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
//  }
  //var h = document.getElementById(id + 'ddheader');
  
  // 将ddconetent显示
  var c = document.getElementById(id + 'ddcontent');
  c.style.display='block';
}

function ddSlide(c,d){
  var currh = c.offsetHeight;
  var dist;
  if(d == 1){
    dist = Math.round((c.maxh - currh) / DDSPEED);
  }else{
    dist = Math.round(currh / DDSPEED);
  }
  if(dist <= 1 && d == 1){
    dist = 1;
  }
  c.style.height = currh + (dist * d) + 'px';
  c.style.opacity = currh / c.maxh;
  c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';
  if(currh > (c.maxh - 2) && d == 1){
    clearInterval(c.timer);
  }else if(dist < 1 && d != 1){
    clearInterval(c.timer);
    c.style.display = 'none';
  }
}