// JavaScript Document
var timerlen = 4;  //smoothness of slide -- lower = smoother
var slideAniLen = 300; //time in milliseconds to completely slide up or down

var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endHeight = new Array();
var moving = new Array();
var dir = new Array();

function slidedown(objname){
  if(moving[objname])
    return;
 
  if(document.getElementById(objname).style.display != "none")
    return; // cannot slide down something that is already visible
 
  moving[objname] = true;
  dir[objname] = "down";
  startslide(objname);
}
 
function slideup(objname){
  if(moving[objname])
    return;
 
  if(document.getElementById(objname).style.display == "none")
    return; // cannot slide up something that is already hidden
 
  moving[objname] = true;
  dir[objname] = "up";
  startslide(objname);
}

function startslide(objname){
  obj[objname] = document.getElementById(objname);
 
  endHeight[objname] = parseInt(obj[objname].style.height);
  startTime[objname] = (new Date()).getTime();
 
  if(dir[objname] == "down"){
    obj[objname].style.height = "1px";
  }
 
  obj[objname].style.display = "block";
  timerID[objname] = setInterval('slidetick("' + objname + '");',timerlen);
}

function slidetick(objname){
  var elapsed = (new Date()).getTime() - startTime[objname];
 
  if (elapsed > slideAniLen)
    endSlide(objname)
  else {
    var d =Math.round(elapsed / slideAniLen * endHeight[objname]);
    if(dir[objname] == "up")
      d = endHeight[objname] - d;
 
    obj[objname].style.height = d + "px";
  }
 
  return;
}

function endSlide(objname){
  clearInterval(timerID[objname]);
 
  if(dir[objname] == "up")
    obj[objname].style.display = "none";
 
  obj[objname].style.height = endHeight[objname] + "px";
 
  delete(moving[objname]);
  delete(timerID[objname]);
  delete(startTime[objname]);
  delete(endHeight[objname]);
  delete(obj[objname]);
  delete(dir[objname]);
 
  return;
}

function toggleSlide(objname){
  if(document.getElementById(objname).style.display == "none"){ // div is hidden, so slide down selection
    //first, slideup any open objects with a class = 'toggle'
	var divs = document.getElementsByTagName('div');
	var divCounter = 1;
	for(var no=0;no<divs.length;no++){
		if(divs[no].className=='toggle'){
			slideup(divs[no].id);
		}		
	}	
	
	//now, slide down the selected object
	slidedown(objname);
		
  }else{ // div is not hidden, so slide up
    slideup(objname);
  }
}