mouse position with jQuery

function doSomething(e)
{
   var posx = 0;
   var posy = 0;
   if (!e) var e = window.event;
   if (e.pageX || e.pageY)
   {
      posx = e.pageX;
      posy = e.pageY;
   }
else if (e.clientX || e.clientY)
   {
      posx = e.clientX;
      posy = e.clientY;
   }
   // posx and posy contain the mouse position relative to the document
   // Do something with this information
}

$(document).mousemove(function(e){
var posx =e.pageX;
var posy=e.pageY;
// Do something with this information
});
//Tested with IE7 and Firefox 2.0