function turnCurrentPageOff(active, options) {   //options can be left blank if not needed
    var options = options || {};
    var zindex = options.zindex || 50;
    var opacity = options.opacity || 70;
    var opaque = (opacity / 100);
    var bgcolor = options.bgcolor || '#000000';
    var dark = document.getElementById('currentActivePageBody');
    if (!dark) {
        var tbody = document.getElementsByTagName("body")[0];
        var tnode = document.createElement('div');
        tnode.style.position = 'absolute';
        tnode.style.top = '0px';
        tnode.style.left = '0px';
        tnode.style.overflow = 'hidden';
        tnode.style.display = 'none';
        tnode.id = 'currentActivePageBody';
        tbody.appendChild(tnode);
        dark = document.getElementById('currentActivePageBody');
    }
    if (active) {
        if (document.body && ( document.body.scrollWidth || document.body.scrollHeight ))
        {
            var pageWidth = document.body.scrollWidth + 'px';
            var pageHeight = document.body.scrollHeight + 'px';
        }
        else if (document.body.offsetWidth)
        {
            var pageWidth = document.body.offsetWidth + 'px';
            var pageHeight = document.body.offsetHeight + 'px';
        }
        else {
            var pageWidth = '100%';
            var pageHeight = '100%';
        }
        dark.style.opacity = opaque;
        dark.style.MozOpacity = opaque;
        dark.style.filter = 'alpha(opacity=' + opacity + ')';
        dark.style.zIndex = zindex;
        dark.style.backgroundColor = bgcolor;
        dark.style.width = pageWidth;
        dark.style.height = pageHeight;
        dark.style.display = 'block';
    }
    else {
        dark.style.display = 'none';
    }
}