function faq_slider($slide_id, $bg_slide) {
document.getElementById('faq1').style.visibility='hidden';
document.getElementById('faq_slide_1').style.backgroundImage='url(images/faq_slide_off.png)';
document.getElementById('faq_slide_1').style.zIndex='104';


document.getElementById('faq2').style.visibility='hidden';
document.getElementById('faq_slide_2').style.backgroundImage='url(images/faq_slide_off.png)';
document.getElementById('faq_slide_2').style.zIndex='103';


document.getElementById('faq3').style.visibility='hidden';
document.getElementById('faq_slide_3').style.backgroundImage='url(images/faq_slide_off.png)';
document.getElementById('faq_slide_3').style.zIndex='102';


document.getElementById('faq4').style.visibility='hidden';
document.getElementById('faq_slide_4').style.backgroundImage='url(images/faq_slide_off.png)';
document.getElementById('faq_slide_4').style.zIndex='101';

document.getElementById($slide_id).style.visibility='visible';
document.getElementById($bg_slide).style.backgroundImage='url(images/faq_slide_on.png)';
document.getElementById($bg_slide).style.zIndex='1000';
}