function Opendiv(id) {
    document.getElementById('ctl02_login').style.display = "block";
    for (i=1;i<=3;i++) { // so you can add more than 12 
        var divname = 'div'+i; 
        var divStyle = document.getElementById(divname).style; 
        divStyle.display=(id==divname)?'block':'none';
        var tabname = 'tab'+i; 
        var tabStyle = document.getElementById(tabname).style;
        tabStyle.backgroundColor = (id == divname) ? '#efefef' : '#b97c1f';
        tabStyle.color = (id == divname) ? '#b97c1f' : '#efefef';
    } 
}

function OpenOfferDiv(id) {
    document.getElementById('offer').style.display = "block";
    for (i = 1; i <= 3; i++) { // so you can add more than 12 
        var divname = 'divOffer' + i;
        var divStyle = document.getElementById(divname).style;
        divStyle.display = (id == divname) ? 'block' : 'none';

        var tabname = 'tabOffer' + i;
        var tabStyle = document.getElementById(tabname).style;
        tabStyle.backgroundColor = (id == divname) ? '#f8f8f8' : '#b97c1f';
        tabStyle.color = (id == divname) ? '#b97c1f' : '#ffffff';
    }
}