function bg(id){

if(id==1){
var bgimage = 'url(images/over_ico.gif)';
document.getElementById('left').style.backgroundImage = bgimage;
document.getElementById('left').style.backgroundPosition='center';
document.getElementById('left').style.backgroundRepeat='no-repeat';
document.getElementById('left').style.height='20px';
document.getElementById('left').style.width='71px';
document.getElementById('left').style.color='#7D7D7D';
}
else if(id == 2){
var bgimage = 'url(null)';
document.getElementById('left').style.backgroundImage = bgimage;

var bgimage = 'url(images/shua.gif)';
document.getElementById('bg2').style.backgroundImage = bgimage;
document.getElementById('bg2').style.height='20px';
document.getElementById('bg2').style.backgroundPosition='center';
document.getElementById('bg2').style.backgroundRepeat='no-repeat';
}

}