var SIDE_NAV_CTL_PREFIX = 'ctl00_sideNav1_';
var res_menu;
var sub_menu;
var res_img;
var res_menu_id = SIDE_NAV_CTL_PREFIX + 'div_iau_resourcces_menu';
var sub_menu_id = SIDE_NAV_CTL_PREFIX + 'div_subsite_menu';
var res_img_id = SIDE_NAV_CTL_PREFIX + 'img_iau_resources';
    
function showHideIAUResourcesMenu()
{
    res_menu = document.getElementById(res_menu_id);
    sub_menu = document.getElementById(sub_menu_id);
    res_img = document.getElementById(res_img_id);
    
    if (res_menu.style.display == 'none')
    {
        slidedown(res_menu_id);
        slideup(sub_menu_id);
        var img_src = res_img.src;
        img_src = img_src.substring(0, img_src.lastIndexOf('/'));
        res_img.src = img_src + '/lbl_resources_up.gif';
        //res_img.src = '../images/lbl_resources_up.gif';
    }
    else
    {
        slideup(res_menu_id);
        slidedown(sub_menu_id);
        var img_src = res_img.src;
        img_src = img_src.substring(0, img_src.lastIndexOf('/'));
        res_img.src = img_src + '/lbl_resources_dn.gif';
        //res_img.src = '../images/lbl_resources_dn.gif';
    }
}

var timerlen = 50;
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();

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);

        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;
}