var timerlen = 5;
var animatetime = 300;
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);  } }