function ch_bg(elem) {
document.getElementById(elem.id).style.background = 'url(images/btn_tb_1_on.jpg)';
}

function ch_bg_2(elem) {
document.getElementById(elem.id).style.background = 'url(images/btn_tb_1.jpg)';
}

function ch_bg_3(elem) {
document.getElementById(elem.id).style.background = 'url(images/btn_tb_2_on.jpg)';
}

function ch_bg_4(elem) {
document.getElementById(elem.id).style.background = 'url(images/btn_tb_2.jpg)';
}

function load_email() {
if(location.search && location.search.substring(7,10)=="yes") {
document.getElementById('pack').innerHTML=items[1]; 
document.getElementById('im2').src='images/butt_tab_2_on.jpg';
document.getElementById('im1').src='images/butt_tab_1_off.jpg';
document.getElementById('ttb').style.background='url(images/top_taba_2.jpg)';
}
}