function toggleAcces() {
    var d = document; {
        document.getElementById('tab2_content').style.display = "block";
        document.getElementById('tab_acces').style.backgroundPosition = "0 0";
        document.getElementById('tab1_content').style.display = "none";
        document.getElementById('tab_contact').style.backgroundPosition = "0 -30px";
    } 
}
function toggleContact() {
    var d = document; {
        document.getElementById('tab1_content').style.display = "block";
        document.getElementById('tab_contact').style.backgroundPosition = "0 0";
        document.getElementById('tab2_content').style.display = "none";
        document.getElementById('tab_acces').style.backgroundPosition = "0 -30px";
    } 
}