function show_layer(x)
{        if(document.getElementById)
   document.getElementById(x).style.visibility = "visible";
}

function hide_layer(x)
{        if(document.getElementById)
           document.getElementById(x).style.visibility = "hidden";
}

function news_over()
{show_layer('news_over');
hide_layer('news_out');}
function news_out()
{hide_layer('news_over');
show_layer('news_out');}

function ueberuns_over()
{show_layer('ueberuns_over');
hide_layer('ueberuns_out');}
function ueberuns_out()
{hide_layer('ueberuns_over');
show_layer('ueberuns_out');}


function angebot_over()
{show_layer('angebot_over');
hide_layer('angebot_out');}
function angebot_out()
{hide_layer('angebot_over');
show_layer('angebot_out');}


function preise_over()
{show_layer('preise_over');
hide_layer('preise_out');}
function preise_out()
{hide_layer('preise_over');
show_layer('preise_out');}


function vertrag_over()
{show_layer('vertrag_over');
hide_layer('vertrag_out');}
function vertrag_out()
{hide_layer('vertrag_over');
show_layer('vertrag_out');}



function impressum_over()
{show_layer('impressum_over');
hide_layer('impressum_out');}
function impressum_out()
{hide_layer('impressum_over');
show_layer('impressum_out');}

function kontakt_over()
{show_layer('kontakt_over');
hide_layer('kontakt_out');}
function kontakt_out()
{hide_layer('kontakt_over');
show_layer('kontakt_out');}

function jobs_over()
{show_layer('jobs_over');
hide_layer('jobs_out');}
function jobs_out()
{hide_layer('jobs_over');
show_layer('jobs_out');}




function news()
{
parent.frames['navigation'].document.getElementById('news_down').style.visibility = "visible";
parent.frames['navigation'].document.getElementById('ueberuns_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('angebot_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('preise_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('vertrag_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('kontakt_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('jobs_down').style.visibility = "hidden";

}

function ueberuns()
{
parent.frames['navigation'].document.getElementById('news_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('ueberuns_down').style.visibility = "visible";
parent.frames['navigation'].document.getElementById('angebot_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('preise_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('vertrag_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('kontakt_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('jobs_down').style.visibility = "hidden";

}

function angebot()
{
parent.frames['navigation'].document.getElementById('news_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('ueberuns_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('angebot_down').style.visibility = "visible";
parent.frames['navigation'].document.getElementById('preise_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('vertrag_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('kontakt_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('jobs_down').style.visibility = "hidden";
}

function preise()
{
parent.frames['navigation'].document.getElementById('news_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('ueberuns_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('angebot_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('preise_down').style.visibility = "visible";
parent.frames['navigation'].document.getElementById('vertrag_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('kontakt_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('jobs_down').style.visibility = "hidden";
}

function vertrag()
{
parent.frames['navigation'].document.getElementById('news_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('ueberuns_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('angebot_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('preise_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('vertrag_down').style.visibility = "visible";
parent.frames['navigation'].document.getElementById('kontakt_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('jobs_down').style.visibility = "hidden";
}

function kontakt()
{
parent.frames['navigation'].document.getElementById('news_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('ueberuns_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('angebot_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('preise_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('vertrag_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('kontakt_down').style.visibility = "visible";
parent.frames['navigation'].document.getElementById('jobs_down').style.visibility = "hidden";
}

function jobs()
{
parent.frames['navigation'].document.getElementById('news_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('ueberuns_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('angebot_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('preise_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('vertrag_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('kontakt_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('jobs_down').style.visibility = "visible";
}


function impressum()
{
parent.frames['navigation'].document.getElementById('news_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('ueberuns_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('angebot_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('preise_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('vertrag_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('kontakt_down').style.visibility = "hidden";
parent.frames['navigation'].document.getElementById('jobs_down').style.visibility = "hidden";
}