var timerlen = 50;
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 slideleft(objname){
        if(moving[objname])
                return;

        if(document.getElementById(objname).style.display != "none")
                return; // cannot slide down something that is already visible

	document.getElementById('greenright').style.display = "block"; // also light up the corner pic.

        moving[objname] = true;
        dir[objname] = "left";
        startslide(objname);
}

function slideright(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] = "right";
        startslide(objname);
}


function slidedown(objname){
        if(moving[objname])
                return;

        if(document.getElementById(objname).style.display != "none")
                return; // cannot slide down something that is already visible

	document.getElementById('greenright').style.display = "block"; // also light up the corner pic.

        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){
if (timerID == null) timerID = new Array();
        obj[objname] = document.getElementById(objname);

	if(dir[objname] == "down"){
	        endHeight[objname] = parseInt(obj[objname].style.height);
	}
	else {
	        endHeight[objname] = parseInt(obj[objname].style.width);
	}

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

        if(dir[objname] == "down"){
                obj[objname].style.height = "1px";
        }
	else {
                obj[objname].style.width = "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" || dir[objname] == "right")
                        d = endHeight[objname] - d;

		if (dir[objname] == "up" || dir[objname] == "down") {
	                obj[objname].style.height = d + "px";
		}
		else {
	                obj[objname].style.width = d + "px";
		}

        }

        return;
}

function endSlide(objname){
 	 if (timerID == null) timerID = new Array();
        clearInterval(timerID[objname]);

        if(dir[objname] == "up" || dir[objname] == "right")
	{
                obj[objname].style.display = "none";
		document.getElementById('greenright').style.display = "none";
	}
	else
	{
		document.getElementById('hidegreenright').style.display = "block";
		document.getElementById('hidegreenleft').style.display = "block";
	}

	if (dir[objname] == "up" || dir[objname] == "down") {
	        obj[objname].style.height = endHeight[objname] + "px";
	}
	else {
	        obj[objname].style.width = endHeight[objname] + "px";
	}

        delete(moving[objname]);
        delete(timerID[objname]);
        delete(startTime[objname]);
        delete(endHeight[objname]);
        delete(obj[objname]);
        delete(dir[objname]);

        return;
}