var timerlen = 5;
var slideAniLen = 250;

var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endHeight = new Array();
var endWidth = 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 slideleft(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] = "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 startslide(objname){
        obj[objname] = document.getElementById(objname);
		if(dir[objname] == "down" || dir[objname] == "up"){
			endHeight[objname] = parseInt(obj[objname].style.height);
		} else {
			endWidth[objname] = parseInt(obj[objname].style.width);
		}
        startTime[objname] = (new Date()).getTime();
        if(dir[objname] == "down"){
                obj[objname].style.height = "1px";
        } else if(dir[objname] == "left") {
				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 {
				if (dir[objname] == "up" || dir[objname] == "down") {
					var d =Math.round(elapsed / slideAniLen * endHeight[objname]);
					if(dir[objname] == "up")
						d = endHeight[objname] - d;
					obj[objname].style.height = d + "px";
				} else {
					var d =Math.round(elapsed / slideAniLen * endWidth[objname]);
					if(dir[objname] == "right")
						d = endWidth[objname] - d;
					obj[objname].style.width = d + "px";
				}
        }
        return;
}

function endSlide(objname){
        clearInterval(timerID[objname]);
		if (dir[objname] == "up" || dir[objname] == "down") {
	        if(dir[objname] == "up")
	                obj[objname].style.display = "none";
	        obj[objname].style.height = endHeight[objname] + "px";
		} else {
	        if(dir[objname] == "right")
	                obj[objname].style.display = "none";
	        obj[objname].style.width = endWidth[objname] + "px";
		}
        delete(moving[objname]);
        delete(timerID[objname]);
        delete(startTime[objname]);
        delete(endHeight[objname]);
		delete(endWidth[objname]);
        delete(obj[objname]);
        delete(dir[objname]);
        return;
}

function toggleSlide(objname,direction){
  if(document.getElementById(objname).style.display == "none"){
    // div is hidden, so let's slide down
	if (direction == "vert") {
		slidedown(objname);
	} else if (direction == "up") {
		slideup(objname);
	} else {
		slideleft(objname);
	}
	// reset the share email form
	if (objname == 'tabshare') {
		var ni = document.getElementById('tabsharemessage');
		ni.innerHTML = "<p>" + shareIntro + "</p>";
	}
  } else {
    // div is not hidden, so slide up
    if (direction == "vert") {
		slideup(objname);
	} if (direction == "up") {
		slidedown(objname);
	} else {
		slideright(objname);
	}
  }
}