var IE = document.all?true:false;
if (!IE) document.captureEvents(Event.MOUSEMOVE)
document.onmousemove = getMouseXY;

var tempX = 0;
var tempY = 0;

function flag() {
  document.getElementById('overDiv').style.display = "block";
}

function nd() {
    document.getElementById('overDiv').style.display = "none";
}

function getMouseXY(e) {
  if (IE) { // IE
    tempX = event.clientX + document.body.scrollLeft + 10;
    tempY = event.clientY + document.body.scrollTop + 10;
  }
  else {  // nicht IE
    tempX = e.pageX + 10;
    tempY = e.pageY + 10;
  }  
  document.getElementById('overDiv').style.left = tempX+"px";
  document.getElementById('overDiv').style.top = tempY+"px";
  return true;
}