//Write the style to make the main table's position absolute
var left = Math.round((screen.availWidth - 770) / 2);
document.write("<style type=\"text/css\">" +
                   "#header { left: " + left + "px; }" +
                   "#mainTable { left: " + left + "px; }" +
                   "#footer { left: " + left + "px; }" +
               "</style>");

var curVisible = null;

//Shows a menu
function showMenu(menu) {
    if (menu == "About") hideMenu("Contact"); else hideMenu("About");

    document.getElementById("lbl"+menu).style.color = "#406EC6";
    document.getElementById("lbl"+menu).style.fontWeight = "bold";
    document.getElementById("mnu"+menu).style.visibility = "visible";
    curVisible=menu;
}

function hideMenu(menu) {
    if (menu != curVisible) {
        document.getElementById("mnu"+menu).style.visibility = "hidden";
        if (menu != curCat) {
            document.getElementById("lbl"+menu).style.color = "Black";
            document.getElementById("lbl"+menu).style.fontWeight = "normal";
        }
    }
}