$get = function(id) { return document.getElementById(id); }
pageX = 0;
pageY = 0;

var ReadersDigest = {
    PopUp: {
        pageX:0,
        pagey:0
    }
};

ReadersDigest.PopUp.showPopUp = function(id, opacity, maxOpacity, resetPosition){
	$get(id).style.display = "block";
	$get(id).style.opacity = maxOpacity/100;
	$get(id).style.left = pageX + "px";
	$get(id).style.top = (pageY+20) + "px";
	
	$get(id).style.filter = "alpha(opacity=" + maxOpacity.toString() + ")";
}

ReadersDigest.PopUp.hidePopUp = function(id){
	$get(id).style.display = "none";
}

ReadersDigest.PopUp.popUpOnMouseMove = function(e) {
    if (navigator.appVersion.indexOf("MSIE") != -1) {
        //IE
        pageX = event.x+document.documentElement.scrollLeft;
        pageY = event.y+document.documentElement.scrollTop;
    }
    else {
        //Firefox
        pageX = e.pageX;
        pageY = e.pageY;
    }
}

document.onmousemove = ReadersDigest.PopUp.popUpOnMouseMove;