var timerlen = 6;
var slideAniLen = 250;

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 slidedown2(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 let's slide down
    slidedown(objname);
  }else{
    // div is not hidden, so slide up
    slideup(objname);
  }
}
function toggleSlideDual(objname, objname2){
  if(document.getElementById(objname).style.display == "none"){
    // div is hidden, so let's slide down
    slidedown(objname);
	pausecomp(50);
	slidedown(objname2);
  }else{
    // div is not hidden, so slide up
    slideup(objname);
  }
}

function swap(objname, objname2){
slideup(objname2);
 Pause.prototype.pause(5);
toggleSlide(objname);
}



 /** constructor 
   
       @param duration integer seconds
       @param <optional> function to run while waiting.
       
    */
   function Pause(duration, busy){
      this.duration= duration * 1000;
      this.busywork = null; // function to call while waiting.
      this.runner = 0;

      if (arguments.length == 2) {
         this.busywork = busy;
      }

      this.pause(this.duration);

   } // Pause class

   /** pause method 
   
       @param duration: integer in seconds
       
    */
   Pause.prototype.pause = function(duration){
      if ( (duration == null) || (duration < 0)) {return;}

      var later = (new Date()).getTime() + duration;

      while(true){
         if ((new Date()).getTime() > later) {
            break;
         }

         this.runner++;

         if (this.busywork != null) {
            this.busywork(this.runner);
         }

      } // while

   } // pause method

function pausecomp(millis) 
{
var date = new Date();
var curDate = null;

do { curDate = new Date(); } 
while(curDate-date < millis);
}