function ShowMenu(event,MenuID)
{
    Menu = document.getElementById(MenuID);
    Menu.style.display = 'block';

}
function HideMenu(event,MenuID)
{
    Menu = document.getElementById(MenuID);
    Menu.style.display = 'none';

}

    
function GetPrev()
{
    if (CurentPage==1) return 0;
    if (CurentPage==2) 
        {document.getElementById('previous').className = 'prev hide';}
    else
        {document.getElementById('previous').className = 'prev show';}
        
    var theid = "ctrcopy_" + CurentPage;
    document.getElementById(theid).style.display = 'none';
    CurentPage = CurentPage -1;
    var theid = "ctrcopy_" + CurentPage;
    document.getElementById(theid).style.display = 'block';
    document.getElementById('next').className = 'next show';
}
function GetNext()
{
    if (CurentPage==PagesNum) return 0;
    if (CurentPage==PagesNum-1) 
        {document.getElementById('next').className = 'next hide';}
    else 
        {document.getElementById('next').className = 'next show';}
    
    var theid = "ctrcopy_" + CurentPage;
    document.getElementById(theid).style.display = 'none';
    CurentPage = CurentPage+1;
    var theid = "ctrcopy_" + CurentPage;
    document.getElementById(theid).style.display = 'block';
    document.getElementById('previous').className = 'prev show';
}