// Fun��o GetCoordinates() 
// fun��o que retorna as coordenadas de um obj na tela, passar o id do obj para fun��o
function getOffsets(e)
{
   var o = {
     height: e.offsetHeight,
     width: e.offsetWidth
   };

   var x = e.offsetLeft;
   var y = e.offsetTop;
   var p = e.offsetParent;

   while(p && (p.nodeType != 9))
   {
     x += p.offsetLeft;
     y += p.offsetTop;
     p = p.offsetParent;
   }
   o.left = x;
   o.top = y;
   return o;

} 
function GetCoordinates(obj)
{
	var elem = document.getElementById();
	var offsets = getOffsets(elem);
	alert('offsets:\n' +
				 'left: '     + offsets.left +  '\n' +
				 'top:  '     + offsets.top  +  '\n' +
				 'width:'     + offsets.width + '\n' +
				 'height: '   + offsets.height);
}