function hover_menu(i)
{
  document.getElementById(i).src = 'gfx/'+i+'_hover.jpg';
}

function return_menu(i, p)
{
  var pages = new Array();
  pages[1] = "home";
  pages[2] = "opleiding";
  pages[3] = "gasballonvaren";
  pages[4] = "heteluchtballonvaren";
  pages[5] = "overig";
  pages[6] = "wiebenik";
  pages[7] = "contact";
  if(p == pages[i.replace('nav0', '')]) {
    iNew=i+'_hover';
  } else {
    iNew=i;
  }
  document.getElementById(i).src = 'gfx/'+iNew+'.jpg';
}