hiddenImgHome= new Image();
hiddenImgHome.src= "images/home_n.gif";
hiddenImgCe= new Image();
hiddenImgCe.src= "images/au_n.gif";
hiddenImgLea= new Image();
hiddenImgLea.src= "images/le_n.gif";
hiddenImgBo= new Image();
hiddenImgBo.src= "images/bo_n.gif";
hiddenImgCnt= new Image();
hiddenImgCnt.src= "images/cnt_n.gif";
function chImg(current,next){current.src = next}