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();
var orighgts = new Array();
var showing;

function set_static_heights() {	
	fpwd = set_static_height(document.getElementById('fpwd'));
	login = set_static_height(document.getElementById('login'));
//  these where testing
//	alert(login.style.height+' '+orighgts[login.id]+' '+orighgts[fpwd.id]);
//  login.style.height = (orighgts[login.id]-orighgts[fpwd.id])+'px';
//	alert(login.style.height);
	reg = set_static_height(document.getElementById('reg'));
}

function get_height(obj) {
	if (Boolean(orighgts[obj.id])) {
		return orighgts[obj.id];
	} else if (parseInt(obj.height) > 0) {
		hgt = parseInt(obj.height);
	} else if (Boolean(obj.scrollHeight)){
		hgt = obj.scrollHeight;
	} else if (Boolean(obj.offsetHeight)) {
		hgt = obj.offsetHeight;
	}
	orighgts[obj.id] = hgt;
	return hgt;
}

function set_static_height(obj) {
	if (Boolean(obj.style.height)) {
		return obj;
	} else {
		hgt = get_height(obj);
//	alert(hgt);
		obj.style.height = hgt + 'px';
		obj.style.display = 'none';
		return obj;
	}
}

function slidedown(objname){
	//this bit keeps opening object parents from closing if nested and then expands a parents height should its child need opening
	parent = document.getElementById(objname).parentNode;
	if (Boolean(showing)) {
		if (showing != parent.id) {//don't close a parent
			moving[showing] = true;
			dir[showing] = "up";
			startslide(showing);
			parent = false;//we need this later
		} else if (showing == parent.id) {//expand the parent
			//alert(get_height(parent) + get_height(document.getElementById(objname)) + 9 + 'px');
			parent.style.height = get_height(parent) + get_height(document.getElementById(objname)) + 9 + 'px';
		}
	} else {
		parent = false;
	}

	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);
	if (Boolean(parent)) {//setup to close the parent in case a parent sibling needs closing
		showing = parent.id;
	} else {
		showing = objname;
	}
}

function slideup(objname){
	if(moving[objname])
		return;
	alert(objname);
	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;
}