/*
	Taken from: http://www.harrymaugans.com/2007/03/06/how-to-create-an-animated-sliding-collapsible-div-with-javascript-and-css/
	Edited by: Andrew Scott <andrew.scott@zu.com>
*/

var timerlen = 5; //smaller number means smoother transition (lower than 5 may be choppy on slower computers)
var slideAniLen = 500; // time (in milliseconds) for the transition to take place

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

function slideright(objname){
  //document.getElementById("home_banner").style.backgroundImage='url(/common/images/homepage/feature-welcome_right_news2.jpg)';
  
  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] = "right";
  startslide(objname);
}

function slideleft(objname){
  //document.getElementById("home_banner").style.backgroundImage='url(/common/images/homepage/feature-welcome_right.jpg)';
  
  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] = "left";
  startslide(objname);
}

function startslide(objname){
  obj[objname] = document.getElementById(objname);
 
  endWidth[objname] = parseInt(obj[objname].style.width);
  startTime[objname] = (new Date()).getTime();
 
  if(dir[objname] == "left"){
    obj[objname].style.width = "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 * endWidth[objname]);
    if(dir[objname] == "right")
      d = endWidth[objname] - d;
 
    obj[objname].style.width = d + "px";
  }
 
  return;
}

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