function showHideMainMenuSubmenu( idSubmenu )
{
  if ( idSubmenu == idSelectedSubMenu )
    hideMainMenuSubmenu( idSubmenu );
  else
  {
    hideMainMenuSubmenu( idSelectedSubMenu );
    showMainMenuSubmenu( idSubmenu );
  }
}

function showMainMenuSubmenu( idSubmenu )
{
  if ( idSubmenu == null )
    return;
  
  var o = document.getElementById('divMainMenuItemSubmenu' + idSubmenu);
  
  if ( o == null )
    return;
  
  o.style.display = 'block';
  idSelectedSubMenu = idSubmenu;
}

function hideMainMenuSubmenu( idSubmenu )
{
  if ( idSubmenu == null )
    return;
  
  var o = document.getElementById('divMainMenuItemSubmenu' + idSubmenu);
  
  if ( o == null )
    return;
  
  o.style.display = 'none';
  idSelectedSubMenu = null;
}

function showImage( imgSrc ) {
  document.getElementById( 'imgPhoto' ).src = 'ImageGet.aspx?resizew=418&resizeh=498&bw=false&imgpath=' + imgSrc;
  document.getElementById( 'hrefPhoto' ).href = imgSrc;
}

function checkForm() {
  if ( !checkEmailFormat( document.getElementById( 'txtEMail' ).value, false ) )
  	alert( 'Il formato dell\'indirizzo e-Mail non è valido!' );
  else
  	document.forms[0].submit();
}