var     hideAll = false;
var     menuPreffix = "menu";   // images preffix (for example menu01.gif)
var     menuOnPreffix = "_a";  // preffix for active elements (for example menu01_on.gif)
var     menuCnt = 6;    // preffix for active elements (for example menu01_on.gif)

function LightCurrent(obj)
{
        if(hideAll) return;
        UnLightAll();

        obj.className = "main_menu_a";
}

function LightDefault()
{
        //if(hideAll) return;
        UnLightAll();
        if(!request) return;
        obj = document.getElementById(menuPreffix+request);
        obj.className = "main_menu_a";
}

function UnLightAll()
{
        if(hideAll) return;
        for(i=1; i<=menuCnt; i++)
        {
                obj = document.getElementById(menuPreffix+i);
                obj.className = "main_menu";     
        }
}

function HideAll()
{
        hideAll = true;
}