// JavaScript Document
<!-- 
function show(idLayer) {document.getElementById(idLayer).style.display='block';}
function hide(idLayer) {document.getElementById(idLayer).style.display='none';}

function change(id, newClass) {
identity=document.getElementById(id);
identity.className=newClass;
}

function nav1(){show('filler_drop');change('nav1','n1h');}
function nav1h(){hide('filler_drop');change('nav1','n1');}

function nav2(){show('charterservices_drop');change('nav2','n2h');}
function nav2h(){hide('charterservices_drop');change('nav2','n2');}

function nav3(){show('filler_drop');change('nav3','n3h');}
function nav3h(){hide('filler_drop');change('nav3','n3');}

function nav4(){show('aircraftmanagement_drop');change('nav4','n4h');}
function nav4h(){hide('aircraftmanagement_drop');change('nav4','n4');}

function nav5(){show('airportops_drop');change('nav5','n5h');}
function nav5h(){hide('airportops_drop');change('nav5','n5');}

function nav6(){show('companyinformation_drop');change('nav6','n6h');}
function nav6h(){hide('companyinformation_drop');change('nav6','n6');}

function nav7(){show('filler_drop');change('nav7','n7h');}
function nav7h(){hide('filler_drop');change('nav7','n7');}

//-->