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);

  }

}