I've been trying to use the findPosX() & findPosY() functions from Peter-Paul Koch's excellent 'quirksmode' site. The purpose of these functions is to find the absolute X and Y co-ordinates of an HTML element. They work well in both Internet Explorer and Firefox, but the results can be pretty rubbish on Safari.

I've made a small adjustment that fixes this problem. I've moved the loop exit from the start of the loop to the middle. Safari was failing to add in the offset of the outermost containing element. Here's the modified code:

function findPosX(obj)
{
  var curleft = 0;
  if(obj.offsetParent)
      while(1)
      {
        curleft += obj.offsetLeft;
        if(!obj.offsetParent)
          break;
        obj = obj.offsetParent;
      }
  else if(obj.x)
      curleft += obj.x;
  return curleft;
}

function findPosY(obj)
{
  var curtop = 0;
  if(obj.offsetParent)
      while(1)
      {
        curtop += obj.offsetTop;
        if(!obj.offsetParent)
          break;
        obj = obj.offsetParent;
      }
  else if(obj.y)
      curtop += obj.y;
  return curtop;
}