button_One = new Image();
button_Two = new Image();
button_Three = new Image();
button_Four = new Image();

button_One.src = "images/misc/contactus/contact_buttons_one.gif";
button_Two.src = "images/misc/contactus//contact_buttons_two.gif";
button_Three.src = "images/misc/contactus/contact_buttons_three.gif";
button_Four.src = "images/misc/contactus/contact_buttons_four.gif";

function setbutton(x) {

    if (document.getElementById('One'))
        document.getElementById('One').style.display = 'none';
    if (document.getElementById('Two'))
        document.getElementById('Two').style.display = 'none';
    if (document.getElementById('Three'))
        document.getElementById('Three').style.display = 'none';
    if (document.getElementById('Four'))
        document.getElementById('Four').style.display = 'none';
        
    document.getElementById(x).style.display = 'block';
    document.getElementById('tabs_Contact_us').className = 'tabs_' + x;
}