function opensub(menu_id){
window.setTimeout("opensub_timeout('"+menu_id+"')", 250);
}

function opensub_timeout(menu_id){
document.getElementById('sub_produkte').style.display = 'none'
document.getElementById('sub_service').style.display = 'none'
document.getElementById('sub_kontakt').style.display = 'none'
document.getElementById('sub_personal').style.display = 'none'

document.getElementById(menu_id).style.display = 'block'
}

function closesub(){
window.setTimeout("closesub_timeout()", 250);
}

function closesub_timeout(){
document.getElementById('sub_produkte').style.display = 'none'
document.getElementById('sub_service').style.display = 'none'
document.getElementById('sub_kontakt').style.display = 'none'
document.getElementById('sub_personal').style.display = 'none'
}