سلام.
این رو امتحان کنید:
var elm = document.getElementById('img');
window.onload = function() {
(window.ActiveXObject) ? document.onmousemove=move_img : document.addEventListener("mousemove", move_img, false);
};
function move_img(e) {
var x = 0, y = 0;
if (window.ActiveXObject || window.opera) {
x = (event.clientX + 5) + document.body.scrollLeft;
y = (event.clientY + 20) + document.body.scrollTop;
} else {
x = (e.pageX + 5);
y = (e.pageY + 50);
}
var temp = document.body.offsetWidth;
elm.style.top = y + "px";
elm.style.right = (temp - x) + 'px';
}
function show_img(obj) {
elm.src = document.getElementById(obj).href;
elm.style.display = 'inline';
}