img1=new Image()
img1.src="images/tabs/residential.jpg"
img1a=new Image()
img1a.src="images/tabs/residential_act.jpg"
img2=new Image()
img2.src="images/tabs/commercial.jpg"
img2a=new Image()
img2a.src="images/tabs/commercial_act.jpg"
img3=new Image()
img3.src="images/tabs/rentals.jpg"
img3a=new Image()
img3a.src="images/tabs/rentals_act.jpg"

function Residential() {
document.getElementById('residential').style.display = "inline";
document.images['residential_img'].src=img1a.src;
document.getElementById('commercial').style.display = "none";
document.images['commercial_img'].src=img2.src;
document.getElementById('rentals').style.display = "none"; 
document.images['rentals_img'].src=img3.src;
}

function Commercial() {
document.getElementById('residential').style.display = "none";
document.images['residential_img'].src=img1.src;
document.getElementById('commercial').style.display = "inline"; 
document.images['commercial_img'].src=img2a.src;
document.getElementById('rentals').style.display = "none";
document.images['rentals_img'].src=img3.src;
}

function Rentals() {
document.getElementById('residential').style.display = "none"; 
document.images['residential_img'].src=img1.src;
document.getElementById('commercial').style.display = "none"; 
document.images['commercial_img'].src=img2.src;
document.getElementById('rentals').style.display = "inline"; 
document.images['rentals_img'].src=img3a.src;
}

function Advanced_Residential() {
document.getElementById('register').style.display = "none";
document.getElementById('advanced').style.display = "inline"; 
}

function Close_Advanced() {
document.getElementById('register').style.display = "inline";
document.getElementById('advanced').style.display = "none"; 
}