var sDimmerPanel = "dimmerpanel" ;
var sDimmerImg = "dimmerimg" ;

function showDimmerPanel() {
    var oDimmerPanel = document.getElementById(sDimmerPanel) ;
    var oDimmerImg = document.getElementById(sDimmerImg) ;
    oPageDimension = getPageDimension() ;
    if (oPageDimension == null) return ;
    var oScrollXY = getScrollXY() ;

    oDimmerPanel.style.width = oPageDimension.width + "px" ;
    oDimmerPanel.style.height = oPageDimension.height + "px" ;
    oDimmerPanel.style.top = oScrollXY.y + "px" ;
    oDimmerPanel.style.left = oScrollXY.x + "px" ;
    
    oDimmerImg.width = oPageDimension.width ;
    oDimmerImg.height = oPageDimension.height ;
    oDimmerPanel.style.visibility = "visible" ;
}

function hideDimmerPanel() {
    var oDimmerPanel = document.getElementById(sDimmerPanel) ;
    oDimmerPanel.style.visibility = "hidden" ;
}