function showPromotionPanel(oPanel, oImg) {
    showDimmerPanel() ;
    oImg.src = promotion_img_file ;
    aPageDimension = getPageDimension() ;
    oPanel.style.width = aPageDimension.width + "px" ;
    oPanel.style.height = aPageDimension.height + "px" ;
    oImg.width = promotion_img_width ;
    oImg.height = promotion_img_height ;
    oPanel.style.visibility = 'visible'
}

function hidePromotionPanel(oPanel) {
    hideDimmerPanel() ;
    oPanel.style.visibility = 'hidden' ;
}