var currentMainMenuItem = null;
var currentSubMenu = null;
function mainMenuItemOver( mainMenuItem )
{
    if( currentMainMenuItem != null ) currentMainMenuItem.className = "main_menu_item";
    if( currentSubMenu != null ) currentSubMenu.style.display = "none";
    currentSubMenu = document.getElementById( mainMenuItem.getAttribute( "submenu" ) );
    currentMainMenuItem = mainMenuItem;
    currentSubMenu.style.display = "block";
    currentMainMenuItem.className = "main_menu_item current_main_menu_item";
}
function closeSubMenu()
{
    if( currentMainMenuItem != null ) currentMainMenuItem.className = "main_menu_item";
    if( currentSubMenu != null ) currentSubMenu.style.display = "none";
}
function startLoad()
{
    document.body.style.cursor = "wait";
    for( var i = 0; i < document.body.getElementsByTagName( "input" ).length; i ++ ) document.body.getElementsByTagName( "input" )[ i ].disabled = true;
    for( var i = 0; i < document.body.getElementsByTagName( "button" ).length; i ++ ) document.body.getElementsByTagName( "button" )[ i ].disabled = true;
    for( var i = 0; i < document.body.getElementsByTagName( "select" ).length; i ++ ) document.body.getElementsByTagName( "select" )[ i ].disabled = true;
    for( var i = 0; i < document.body.getElementsByTagName( "textarea" ).length; i ++ ) document.body.getElementsByTagName( "textarea" )[ i ].disabled = true;
}
function endLoad()
{
    document.body.style.cursor = "default";
    for( var i = 0; i < document.body.getElementsByTagName( "input" ).length; i ++ ) document.body.getElementsByTagName( "input" )[ i ].disabled = false;
    for( var i = 0; i < document.body.getElementsByTagName( "button" ).length; i ++ ) document.body.getElementsByTagName( "button" )[ i ].disabled = false;
    for( var i = 0; i < document.body.getElementsByTagName( "select" ).length; i ++ ) document.body.getElementsByTagName( "select" )[ i ].disabled = false;
    for( var i = 0; i < document.body.getElementsByTagName( "textarea" ).length; i ++ ) document.body.getElementsByTagName( "textarea" )[ i ].disabled = false;
}