function changetext(elemname,argval,disptxt) {
 switch (argval) {
  case 1:
   document.getElementById(elemname).innerHTML = 'The old website';
   break;
  case 2:
   document.getElementById(elemname).innerHTML = 'Photography';
   break;
  case 3:
   document.getElementById(elemname).innerHTML = 'Cinematics';
   break;
  case 4:
   document.getElementById(elemname).innerHTML = 'Research';
   break;
  case 5:
   document.getElementById(elemname).innerHTML = 'About';
   break;
  case 6:
   document.getElementById(elemname).innerHTML = 'Travel';
   break;
  case -1:
   document.getElementById(elemname).innerHTML = disptxt;
   break;
 }
}

function mp_ov(arg) {
 changetext('mp_info',arg,'');
}

function mn_ov(arg) {
 changetext('mn_info',arg,'');
}

function ph_ov(arg) {
 changetext('ph_over',-1,arg);
}

function mp_ou() {
 changetext('mp_info',-1,'');
}

function mn_ou() {
 changetext('mn_info',-1,'<a href="http://www.doubleyoudigital.nl">&laquo;&laquo;</a>');
}

function ph_ou(arg) {
 changetext('ph_over',-1,'');
}

function ab_load(arg) {
  var styles=new Array("ab_pho","ab_img","ab_img","ab_geo","ab_tra","ab_car")
  var all = document.all ? document.all : document.getElementsByTagName('*');
  for (var e = 0; e < all.length; e++) {
    for ( var x = 0 ; x <= styles.length ; x++ ) {
      if ( styles[x] == all[e].className )
        all[e].style.borderBottom = 'none';
    }
    if (all[e].className == arg)
      all[e].style.borderBottom = '1px solid #FFFFFF';
  }
  frames['ab_frame'].location.href=arg+".html";
}

//preload images
if (document.images) {
   img1 = new Image();
   img2 = new Image();
   img3 = new Image();
   img4 = new Image();
   img5 = new Image();
   img6 = new Image();
   img7 = new Image();
   img8 = new Image();
   img9 = new Image();
   img1.src = "imgs/mp_old.gif";
   img2.src = "imgs/mp_photo.gif";
   img3.src = "imgs/mp_video.gif";
   img4.src = "imgs/mp_research.gif";
   img5.src = "imgs/mp_about.gif";
   img6.src = "imgs/mp_photo_s.gif";
   img7.src = "imgs/mp_video_s.gif";
   img8.src = "imgs/mp_research_s.gif";
   img9.src = "imgs/mp_about_s.gif";
}