// JavaScript Document
function subnav1() {
document.getElementById("tab1").style.background="url(images/index_r4_c7.jpg)";
document.getElementById("tab2").style.background="url(images/design/index_r4_c8_1.jpg)";
document.getElementById("st2").style.display="block";
document.getElementById("st2_1").style.display="none";
}

function subnav2() {
document.getElementById("tab1").style.background="url(images/index_r4_c7_sub.jpg)";
document.getElementById("tab2").style.background="url(images/design/index_r4_c8_1_sub.jpg)";
document.getElementById("st2_1").style.display="block";
document.getElementById("st2").style.display="none";
}

function subnav3() {
document.getElementById("tab3").style.background="url(images/index_r6_c2.jpg)";
document.getElementById("tab4").style.background="url(images/index_r6_c3.jpg)";
document.getElementById("st1").style.display="block";
document.getElementById("st1_1").style.display="none";
}

function subnav4() {
document.getElementById("tab3").style.background="url(images/index_r6_c2_sub.jpg)";
document.getElementById("tab4").style.background="url(images/index_r6_c3_sub.jpg)";
document.getElementById("st1_1").style.display="block";
document.getElementById("st1").style.display="none";
}