Need help with Mootools Accordion Script

I am developing a joomla site using mootools accordio nscript. Its a joomla site using accordion module. all the things working perfect except.
Demo site url : http://shape5.com/demo/elegance/index.php?option=com_content&view=article&id=56&Itemid=98
Please see the s5 accordio nmenu on the right side

when user click menus the down arrow image is working correctly after click the same menu the arrow image is not changing to left arrow image. You can see the demo work here:
http://shape5.com/demo/elegance/index.php?option=com_content&view=article&id=56&Itemid=98

I am posting the code here:



function s5_am_addJavascript(s5_am_jsname,s5_am_pos) {
var s5_am_th = document.getElementsByTagName(s5_am_pos)[0];
var s5_am_s = document.createElement('script');
s5_am_s.setAttribute('type','text/javascript');
s5_am_s.setAttribute('src',s5_am_jsname);
s5_am_th.appendChild(s5_am_s);
}
if ($$.shared) {}

else {
s5_am_addJavascript('/media/system/js/mootools.js','head');
}


window.addEvent('domready', function(){


if (s5_am_parent_link_enabled == "0") {
var s5_am_parent_link = document.getElementById("s5_accordion_menu").getElementsByTagName("A");
for (var s5_am_parent_link_y=0; s5_am_parent_link_y<s5_am_parent_link.length; s5_am_parent_link_y++) {
if (s5_am_parent_link[s5_am_parent_link_y].parentNode.parentNode.tagName == "H3") {
s5_am_parent_link[s5_am_parent_link_y].href = "javascript:;";
}
}
}

function s5_am_h3_background_load() {
var s5_am_h3_close = document.getElementById("s5_accordion_menu").getElementsByTagName("H3");
for (var s5_am_h3_close_y=0; s5_am_h3_close_y<s5_am_h3_close.length; s5_am_h3_close_y++) {
s5_am_h3_close[s5_am_h3_close_y].className = "s5_am_toggler";
}
this.className = "s5_am_toggler s5_am_open";
}

var s5_am_h3_background = document.getElementById("s5_accordion_menu").getElementsByTagName("H3");
for (var s5_am_h3_background_y=0; s5_am_h3_background_y<s5_am_h3_background.length; s5_am_h3_background_y++) {
s5_am_h3_background[s5_am_h3_background_y].onclick = s5_am_h3_background_load;
}

var s5_am_element = document.getElementById("s5_accordion_menu").getElementsByTagName("DIV");
for (var s5_am_element_y=0; s5_am_element_y<s5_am_element.length; s5_am_element_y++) {
if (s5_am_element[s5_am_element_y].className == "s5_accordion_menu_element") {
s5_am_element[s5_am_element_y].style.display = s5_accordion_menu_display;
}
}

if(parent_Itemid==undefined || parent_Itemid=="" ) {
var s5_am_current_level = 0;
}else {
var s5_am_current_level = parent_Itemid;
}


var s5_am_h3_current = document.getElementById("s5_accordion_menu").getElementsByTagName("H3");
for (var s5_am_h3_current_y=0; s5_am_h3_current_y<s5_am_h3_current.length; s5_am_h3_current_y++) {
if (s5_am_h3_current[s5_am_h3_current_y].id == "current") {
s5_am_current_level = s5_am_h3_current_y;
}
}

var s5_am_li_current = document.getElementById("s5_accordion_menu").getElementsByTagName("LI");
for (var s5_am_li_current_y=0; s5_am_li_current_y<s5_am_li_current.length; s5_am_li_current_y++) {
if (s5_am_li_current[s5_am_li_current_y].id == "current") {

if (s5_am_li_current[s5_am_li_current_y].parentNode.parentNode.className == "s5_accordion_menu_element") {
s5_am_li_current[s5_am_li_current_y].parentNode.parentNode.id = "s5_am_parent_div_current";
}

else if (s5_am_li_current[s5_am_li_current_y].parentNode.parentNode.parentNode.className == "s5_accordion_menu_element") {
s5_am_li_current[s5_am_li_current_y].parentNode.parentNode.parentNode.id = "s5_am_parent_div_current";
}

else if (s5_am_li_current[s5_am_li_current_y].parentNode.parentNode.parentNode.parentNode.className == "s5_accordion_menu_element") {
s5_am_li_current[s5_am_li_current_y].parentNode.parentNode.parentNode.parentNode.id = "s5_am_parent_div_current";
}

else if (s5_am_li_current[s5_am_li_current_y].parentNode.parentNode.parentNode.parentNode.parentNode.className == "s5_accordion_menu_element") {
s5_am_li_current[s5_am_li_current_y].parentNode.parentNode.parentNode.parentNode.parentNode.id = "s5_am_parent_div_current";
}

var s5_am_div_current = document.getElementById("s5_accordion_menu").getElementsByTagName("DIV");
for (var s5_am_div_current_y=0; s5_am_div_current_y<s5_am_div_current.length; s5_am_div_current_y++) {
if (s5_am_div_current[s5_am_div_current_y].id == "s5_am_parent_div_current") {
s5_am_current_level = s5_am_div_current_y - 1;
}
}

}
}


s5_am_openElement = s5_am_current_level;

var s5_accordion_menu = new Accordion($('s5_accordion_menu'), 'h3.s5_am_toggler', 'div.s5_accordion_menu_element', {
opacity: true,
allowMultipleOpen: true,
display: s5_am_openElement,
alwaysHide: true
});

var s5_am_h3_first = document.getElementById("s5_accordion_menu").getElementsByTagName("H3");
for (var s5_am_h3_first_y=0; s5_am_h3_first_y<s5_am_h3_first.length; s5_am_h3_first_y++) {
if (s5_am_h3_first_y == s5_am_current_level) {
s5_am_h3_first[s5_am_h3_first_y].className = "s5_am_toggler s5_am_open";
}
}


});

 

I just find a solution, and it works, in the code replace the s5_am_h3_background_load() function by :

function s5_am_h3_background_load() {
		    
			var tmpclass=this.className;
			var s5_am_h3_close = document.getElementById("s5_accordion_menu").getElementsByTagName("H3");
			for (var s5_am_h3_close_y=0; s5_am_h3_close_y<s5_am_h3_close.length; s5_am_h3_close_y++) {
					
					s5_am_h3_close[s5_am_h3_close_y].className = "s5_am_toggler";
			}
			if (tmpclass=="s5_am_toggler"){
				this.className = "s5_am_toggler s5_am_open";
			}
		}

PHP: