//
var sPageName = "hm";
function init_nav(){
    var sQueryName = "pg";
    var sQuery = location.search.substring(1);
    var sPairs = sQuery.split("&");
    if (sPairs.length > 0){
        var splitPosition = sPairs[0].indexOf('=');
        sPageName = sPairs[0].substring(splitPosition+1);
    }
    menuItemActive(sPageName);
}
function menuItemMouseOver(oObject, sMenuItem){
    if (sPageName != sMenuItem){
        oObject.className='navigation_button_hover';
    }
    showSubNavigation(sMenuItem);
}

function menuItemMouseOut(oObject, sMenuItem){
    if (sPageName != sMenuItem){
        oObject.className='navigation_button';
    } 
    hideSubNavigation(sMenuItem);
}

function menuItemActive(sPage){
    var navigationArray = document.getElementById('navigation_members').childNodes;
    for (var i=0; i<navigationArray.length; i++){
        var mnuItem = navigationArray[i];
        if (sPage == mnuItem.rel){
            mnuItem.className = 'navigation_button_active';
        }
    }
}

function showSubNavigation(oSubNav){
    var subnav = document.getElementById(oSubNav);
    subnav.style.visibility = 'visible';
}
function hideSubNavigation(oSubNav){
    var subnav = document.getElementById(oSubNav);
    subnav.style.visibility = 'hidden';   
}