var timerlen = 5;
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 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);
		  }
		}