function showLayer1()
{
document.getElementById("tab1").style.visibility='visible';
document.getElementById("tab2").style.visibility='hidden';
document.getElementById("tab3").style.visibility='hidden';
document.getElementById("tab4").style.visibility='hidden';
document.getElementById("tab5").style.visibility='hidden';
document.getElementById("tab6").style.visibility='hidden';
document.getElementById("menu1").style.color='#ff6600';
document.getElementById("menu2").style.color='#000066';
document.getElementById("menu3").style.color='#000066';
document.getElementById("menu4").style.color='#000066';
document.getElementById("menu5").style.color='#000066';
document.getElementById("menu6").style.color='#000066';
}

function showLayer2()
{
document.getElementById("tab2").style.visibility='visible';
document.getElementById("tab1").style.visibility='hidden';
document.getElementById("tab3").style.visibility='hidden';
document.getElementById("tab4").style.visibility='hidden';
document.getElementById("tab5").style.visibility='hidden';
document.getElementById("tab6").style.visibility='hidden';
document.getElementById("menu1").style.color='#000066';
document.getElementById("menu2").style.color='#ff6600';
document.getElementById("menu3").style.color='#000066';
document.getElementById("menu4").style.color='#000066';
document.getElementById("menu5").style.color='#000066';
document.getElementById("menu6").style.color='#000066';
}

function showLayer3()
{
document.getElementById("tab3").style.visibility='visible';
document.getElementById("tab1").style.visibility='hidden';
document.getElementById("tab2").style.visibility='hidden';
document.getElementById("tab4").style.visibility='hidden';
document.getElementById("tab5").style.visibility='hidden';
document.getElementById("tab6").style.visibility='hidden';
document.getElementById("menu1").style.color='#000066';
document.getElementById("menu2").style.color='#000066';
document.getElementById("menu3").style.color='#ff6600';
document.getElementById("menu4").style.color='#000066';
document.getElementById("menu5").style.color='#000066';
document.getElementById("menu6").style.color='#000066';
}

function showLayer4()
{
document.getElementById("tab4").style.visibility='visible';
document.getElementById("tab1").style.visibility='hidden';
document.getElementById("tab2").style.visibility='hidden';
document.getElementById("tab3").style.visibility='hidden';
document.getElementById("tab5").style.visibility='hidden';
document.getElementById("tab6").style.visibility='hidden';
document.getElementById("menu1").style.color='#000066';
document.getElementById("menu2").style.color='#000066';
document.getElementById("menu3").style.color='#000066';
document.getElementById("menu4").style.color='#ff6600';
document.getElementById("menu5").style.color='#000066';
document.getElementById("menu6").style.color='#000066';
}

function showLayer5()
{
document.getElementById("tab5").style.visibility='visible';
document.getElementById("tab1").style.visibility='hidden';
document.getElementById("tab2").style.visibility='hidden';
document.getElementById("tab3").style.visibility='hidden';
document.getElementById("tab4").style.visibility='hidden';
document.getElementById("tab6").style.visibility='hidden';
document.getElementById("menu1").style.color='#000066';
document.getElementById("menu2").style.color='#000066';
document.getElementById("menu3").style.color='#000066';
document.getElementById("menu4").style.color='#000066';
document.getElementById("menu5").style.color='#ff6600';
document.getElementById("menu6").style.color='#000066';
}
function showLayer6()
{
document.getElementById("tab6").style.visibility='visible';
document.getElementById("tab1").style.visibility='hidden';
document.getElementById("tab2").style.visibility='hidden';
document.getElementById("tab3").style.visibility='hidden';
document.getElementById("tab4").style.visibility='hidden';
document.getElementById("tab5").style.visibility='hidden';
document.getElementById("menu1").style.color='#000066';
document.getElementById("menu2").style.color='#000066';
document.getElementById("menu3").style.color='#000066';
document.getElementById("menu4").style.color='#000066';
document.getElementById("menu5").style.color='#000066';
document.getElementById("menu6").style.color='#ff6600';
}