var timerlen = 5;
var slideAniLen = 150;

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

function openMenu(objname, width, ajar){
        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";
        init(objname, width, ajar);
}

function closeMenu(objname, width, ajar){
        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";
        init(objname, width, ajar);
}

function init(objname, width, ajar){
        obj[objname] = document.getElementById(objname);

        endWidth[objname] = width;
        startTime[objname] = (new Date()).getTime();

        if(dir[objname] == "down"){
                obj[objname].style.width = width;
        }
		if(dir[objname] == "up"){
				
                obj[objname].style.width = width-ajar;
        }

        obj[objname].style.display = "block";

        timerID[objname] = setInterval('animate('+ajar+',\'' + objname + '\');',timerlen);
}

function animate(ajar, objname){
        var elapsed = (new Date()).getTime() - startTime[objname];

        if (elapsed > slideAniLen){
			if(dir[objname] == "down"){
				setOverflow('categoryCheckboxes', "auto");
			}
            cleanup(objname);
		}else {
                var d =Math.round(elapsed / slideAniLen * endWidth[objname]);
                if(dir[objname] == "up")
                        d = endWidth[objname] - d+ajar;

                obj[objname].style.width = d + "px";
        }
		
        return;
}

function cleanup(objname){
        clearInterval(timerID[objname]);

        if(dir[objname] == "up")
                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;
}


function toggleSlide(objname, width, ajar){
	if(document.getElementById(objname).style.display == "none"){
		// div is hidden, open Menu
		openMenu(objname, width, ajar);
        document.getElementById("switch").style.display = "none"; 
		document.getElementById("switchImage").src = "";
	}else{
		// div is not hidden, close Menu
		setOverflow('categoryCheckboxes', "hidden");
		closeMenu(objname, width, ajar);
		document.getElementById("switchImage").src = rootImageDirectory+"elements/showLegend.png";
        document.getElementById("switch").style.display = "block"; 

	}
}

function setOverflow(divName, value){
	document.getElementById(divName).style.overflow = value;
}