function SwapImage(ImgName, ImgSrc) {
document.images[ImgName].src=ImgSrc;
}

PreImg=new Array();
for(i=1; i<=6; i++) {
PreImg[i]=new Image();
}
PreImg[1].src="../larecolte/img/header_btn_topics_o.gif";
PreImg[2].src="../larecolte/img/header_btn_shop02_o.gif";
PreImg[3].src="../larecolte/img/header_btn_particular_o.gif";
PreImg[4].src="../larecolte/img/header_btn_campany02_o.gif";
PreImg[5].src="../larecolte/img/header_btn_recruit_o.gif";
PreImg[6].src="../larecolte/img/header_btn_nationwide_o.gif";