var arrSubBanners = new Array();
arrSubBanners['a'] = 'sub_a.jpg';
arrSubBanners['c'] = 'sub_c.jpg';
arrSubBanners['d'] = 'sub_d.jpg';
arrSubBanners['f'] = 'sub_f.jpg';
arrSubBanners['g'] = 'sub_g.jpg';
arrSubBanners['h'] = 'sub_h.jpg';
arrSubBanners['m'] = 'sub_m.jpg';
arrSubBanners['p'] = 'sub_p.jpg';

var arrSubBannersExceptions = new Array();
arrSubBannersExceptions['hom'] = 'g';
arrSubBannersExceptions['dir'] = 'g';

function showSubBanner( heading ) {
  var ele = document.getElementById('menu1Actief');
  if( ele ) {
    var heading = ele.firstChild.firstChild.nodeValue;
    //set sub_header
    var txt = document.createTextNode(heading);    
    document.getElementById('page_header').appendChild(txt);
    //set subbanner
    
    //check for exceptions
    var firstLetter = '';
    if( arrSubBannersExceptions[ heading.substring(0,3).toLowerCase() ] != undefined  )
    { firstLetter = arrSubBannersExceptions[ heading.substring(0,3).toLowerCase() ]; }
    else
    { firstLetter = heading.substring(0,1).toLowerCase(); }
    if( arrSubBanners[firstLetter] != undefined ) {
      document.write( '<img id="awsubBanner" src="./templates/client/images/'+ arrSubBanners[firstLetter]  +'">' );
    }  
  }
}