var activeMenu=null;

function initMenu()
{
	activeMenu=readCookie('o_menu');
	var subs=getElementsByClassName('subCats', document.getElementById('menu'));
	for ( i=0 ; i<subs.length ; ++i )
		if (subs[i].id!=activeMenu)
			hideMenu(subs[i].id);
}

function hideMenu(id)
{
	document.getElementById(id).style.display="none";
	document.getElementById(id.replace('sub', 'a')).innerHTML='+';
	if (id==activeMenu)
	{
		eraseCookie('o_menu');
		activeMenu=null;
	}
}

function showMenu(id)
{
	var menu="sub_" + id;
	if (!document.getElementById(menu))
		return;
	if (activeMenu)
		hideMenu(activeMenu);
	document.getElementById(menu).style.display="block";
	document.getElementById(menu.replace('sub', 'a')).innerHTML='-';
	activeMenu=menu;
	createCookie('o_menu', activeMenu, 30);
}

function toggleMenu(id)
{
	if (activeMenu=="sub_" + id)
		hideMenu(activeMenu);
	else
		showMenu(id);
}

function createCookie(name, value, days)
{
	var expires="";
	if (days)
	{
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		expires = "; expires="+date.toGMTString();
	}
	document.cookie = name + "=" + value + expires + "; path=/";
}

function readCookie(name) 
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}

function getElementsByClassName(clsName, fromElement){
    var retVal = new Array();
    if (!fromElement)
    	fromElement=document;
    var elements = fromElement.getElementsByTagName("*");
    for(var i = 0;i < elements.length;i++){
        if(elements[i].className.indexOf(" ") >= 0){
            var classes = elements[i].className.split(" ");
            for(var j = 0;j < classes.length;j++){
                if(classes[j] == clsName)
                    retVal.push(elements[i]);
            }
        }
        else if(elements[i].className == clsName)
            retVal.push(elements[i]);
    }
    return retVal;
}