var timerlen = 5;
var slideAniLen = 1000;
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 toggle(objname){
	if(document.getElementById(objname).style.display == "none") 
		slidedown(objname);
	else 
		slideup(objname);
}

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 startslide(objname){
	obj[objname] = document.getElementById(objname);
	if(dir[objname] == "down"){
		obj[objname].style.height = "1px";
	}
	obj[objname].style.display = "block";
	startTime[objname] = (new Date()).getTime();
	endHeight[objname] = obj[objname].scrollHeight;
	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]);
	var f =elapsed / slideAniLen;
	if(dir[objname] == "up"){
	d = endHeight[objname] - d;
	f = 1 - f;}
	obj[objname].style.height = d + "px";
	obj[objname].style.opacity = f;
	obj[objname].style.filter = 'alpha(opacity='+(f*100)+')';
	document.getElementById(objname).value=f;
	}
	return;
}

function endSlide(objname){
	clearInterval(timerID[objname]);
	if(dir[objname] == "up"){
		obj[objname].style.display = "none";
		obj[objname].style.opacity = 0;
		obj[objname].style.filter = 'alpha(opacity='+(0)+')';
	}
	else{
		obj[objname].style.opacity = 1;
		obj[objname].style.filter = "";
		
	}
	obj[objname].style.height = "auto";
	delete(moving[objname]);
	delete(timerID[objname]);
	delete(startTime[objname]);
	delete(endHeight[objname]);
	delete(obj[objname]);
	delete(dir[objname]);
	return;
}