var array = new Array();
var speed = 7;
var timer = 20;

function slider(target,showfirst) {
  var slider = document.getElementById(target);
  var divs = slider.getElementsByTagName('div');
  var divslength = divs.length;
  for(i = 0; i < divslength; i++) {
    var div = divs[i];
    var divid = div.id;
    if(divid.indexOf("header") != -1) {
      div.onclick = new Function("processClick(this)");
    } else if(divid.indexOf("content") != -1) {
      var section = divid.replace('-content','');
      array.push(section);
      div.maxh = div.offsetHeight;
      if(showfirst == 1 && i == 1) {
        div.style.display = 'block';
      } else {
        div.style.display = 'none';
      }
    } 
  }
}

function processClick(div) {
  var catlength = array.length;
  for(i = 0; i < catlength; i++) {
    var section = array[i];
    var head = document.getElementById(section + '-header');
    var cont = section + '-content';
    var contdiv = document.getElementById(cont);
    clearInterval(contdiv.timer);
    if(head == div && contdiv.style.display == 'none') {
      contdiv.style.height = '0px';
      contdiv.style.display = 'block';
      initSlide(cont,1);
    } else if(contdiv.style.display == 'block') {
      initSlide(cont,-1);
    }
  }
}

function initSlide(id,dir) {
  var cont = document.getElementById(id);
  var maxh = cont.maxh;
  cont.direction = dir;
  cont.timer = setInterval("slide('" + id + "')", timer);
}

function slide(id) {
  var cont = document.getElementById(id);
  var maxh = cont.maxh;	
  var currheight = cont.offsetHeight;
  var dist;

  if(cont.direction == 1)
  	{dist = (Math.round((maxh - currheight) / speed));}
  else
        {dist = (Math.round(currheight / speed));}

  if(dist <= 10)
  	{dist = 10;}

  cont.style.height = currheight + (dist * cont.direction) + 'px';
  cont.style.opacity = currheight / cont.maxh;
  cont.style.filter = 'alpha(opacity=' + (currheight * 100 / cont.maxh) + ')';
  if(currheight < 20 && cont.direction != 1) {
    cont.style.display = 'none';
    clearInterval(cont.timer);
  } else if(currheight > (maxh - 20) && cont.direction == 1) {
    cont.style.height = maxh + 'px';
    cont.style.opacity = 1;
    cont.style.filter = 'alpha(opacity=100)';
    clearInterval(cont.timer);
  }
}