var timerlen = 5;
var slideAniLen = 500;

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

function slideup(objname){
	
	if(moving[objname]) return;
	if(document.getElementById(objname).style.display == "none") return;
	
	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 toggleSlide(objname){
	if(document.getElementById(objname).style.display == "none"){
		slidedown(objname);
	} else {
		slideup(objname);
	}
}

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;
}