function ShowAd() {

    var bgDiv;
    var messageDiv

    if (document.all) {
        bgDiv = document.all['bgDiv'];
        messageDiv = document.all['messageDiv'];
    }
    else if (document.getElementById) {
    bgDiv = document.getElementById('bgDiv');
    messageDiv = document.getElementById('messageDiv');
    }

    if (bgDiv && messageDiv) {

        bgDiv.style.display = 'block';
        messageDiv.style.display = 'block';

        if (/MSIE (\d+\.\d+);/.test(navigator.userAgent)) { //test for MSIE x.x;
            var ieversion = new Number(RegExp.$1) // capture x.x portion and store as a number
            if (ieversion <= 6) {

                var xScroll, yScroll;

                if (window.innerHeight && window.scrollMaxY) {
                    xScroll = window.innerWidth + window.scrollMaxX;
                    yScroll = window.innerHeight + window.scrollMaxY;
                } else if (document.body.scrollHeight > document.body.offsetHeight) { // all but Explorer Mac
                    xScroll = document.body.scrollWidth;
                    yScroll = document.body.scrollHeight;
                } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
                    xScroll = document.body.offsetWidth;
                    yScroll = document.body.offsetHeight;
                }

                var windowWidth, windowHeight;

                if (self.innerHeight) {	// all except Explorer
                    if (document.documentElement.clientWidth) {
                        windowWidth = document.documentElement.clientWidth;
                    } else {
                        windowWidth = self.innerWidth;
                    }
                    windowHeight = self.innerHeight;
                } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
                    windowWidth = document.documentElement.clientWidth;
                    windowHeight = document.documentElement.clientHeight;
                } else if (document.body) { // other Explorers
                    windowWidth = document.body.clientWidth;
                    windowHeight = document.body.clientHeight;
                }

                // for small pages with total height less then height of the viewport
                if (yScroll < windowHeight) {
                    pageHeight = windowHeight;
                } else {
                    pageHeight = yScroll;
                }

                // for small pages with total width less then width of the viewport
                if (xScroll < windowWidth) {
                    pageWidth = xScroll;
                } else {
                    pageWidth = windowWidth;
                }            
                
                bgDiv.style.width = pageWidth + 'px';
                bgDiv.style.height = pageHeight + 'px';
            }
        }        
    }
}

function CloseAd()
{
    var bgDiv;
    var messageDiv

    if (document.all) {
        bgDiv = document.all['bgDiv'];
        messageDiv = document.all['messageDiv'];
    }
    else if (document.getElementById) {
        bgDiv = document.getElementById('bgDiv');
        messageDiv = document.getElementById('messageDiv');
    }

    if (bgDiv)
        bgDiv.style.display = 'none';
    
    if (messageDiv)
        messageDiv.style.display = 'none';
}