function showImg () {
var img1='/images/09/header/0.jpg';
var seci=thisTopicId;
if (seci.length>4) seci=seci.substring(3,5);
//alert(seci);
switch (seci) {
case "AB": img1='/images/09/header/0.jpg';break;
case "NM": img1='/images/09/header/9.jpg';break;
case "PD": img1='/images/09/header/16.jpg';break;
case "PG": img1='/images/09/header/23.jpg';break;
case "RS": img1='/images/09/header/13.jpg';break;
case "AC": img1='/images/09/header/10.jpg';break;
}

var strImg = '<img src="' + img1 + '" width="898" height="140">';
document.write(strImg);

}