var BImg= new Array();
var BkStl= new Array();

BImg[0]= new Image() ; BImg[0].src="/img/common/menu_bg01.gif";
BImg[1]= new Image() ; BImg[1].src="/img/common/menu_bg02.gif";
BImg[2]= new Image() ; BImg[2].src="/img/common/menu_bg03.gif";

BkStl[0]="url(/img/common/menu_bg01.gif)";
BkStl[1]="url(/img/common/menu_bg02.gif)";
BkStl[2]="url(/img/common/menu_bg03.gif)";

function TDBkCh(i){
if (document.getElementById){
document.getElementById("menu").style.background = BkStl[i];
document.getElementById("menu").style.backgroundPosition = 'center top';
}
}