document.onmousemove = setCoords; 
var absolute_x, absolute_y, relative_x, relative_y; 

function setCoords(e){ 
  if (!e) e = window.event;
  var browser = navigator.userAgent; 
  if(document.all){
    var b = $('content');
    absolute_x = e.clientX + b.scrollLeft;
    absolute_y = e.clientY + b.scrollTop;
    relative_x = e.clientX;
    relative_y = e.clientY;
  } 
  else{ 
    absolute_x = e.pageX; 
    absolute_y = e.pageY; 
    relative_x = e.clientX; 
    relative_y = e.clientY; 
  } 
}

function popup(id) {
  if ($(id).style.display != 'block') {
    var width = parseInt($(id).style.width);
    var height = $(id).style.height ? parseInt($(id).style.height) : 200;
    $(id).style.top = (relative_y - 100) + 'px';
    $(id).style.left = (relative_x - 250) + 'px';
    $(id).style.display = 'block';
  } else {
    $(id).style.display = 'none';
  }
  
}