Find y position of bottom of element on web page and determine how much space is left

I need to be able to find the position of the bottom of a tabstrip on a webpage in order to determine how much space is left in the window clientheight space. Then I will add a division to what area is left based on the user's window size. This area will have a scroll bar and must be visible without using the browser scroll bar on the right.
The tabstrip is displayed. When a user clicks on a specific tab, a dynamic table will be displayed in the remaining area. The table is larger than the window size so the division around the table places a scrollbar at the bottom and right. I want to dynamically calculate this area no matter what the user's window size is.

TAB1    Tab2   Tab3 Tab4 Tab5
---------------------------------------------------------------------------------------------------------------------------------
table                                                                                                                                                          I    *
                                                                                                                                                                 I    *
                                                                                                                                                                 I    *
                                                                                                                              division right scroll bar        *
                                                                                                                                                                 I    *
division scroll bar---------------------------------------------------------------------------------------------------------------  *
browser scroll bar***********************************************************************

C_J_LAsked:
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sganjamConnect With a Mentor Commented:
function PosX(obj){
      var curleft = 0;
      if (obj.offsetParent)
      {
            while (obj.offsetParent)
            {
                  curleft += obj.offsetLeft
                  obj = obj.offsetParent;
            }
      }
      else if (obj.x)
            curleft += obj.x;
               return curleft;
}

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

The above two functions will calculate the  X (from left) and Y (from top) position of the Top-Left corner of the object in pixels . You can then manipulate it by adding on the object width or height. Use the following:

obj.offsetheight (for height of the object)
obj.offsetwidth (for width of the object)

You can also use

document.body.offsetWidth
document.body.offsetHeight

For the screen width and height respectively. Just make sure to define an arbitrary width and height to the body tag.

If you wanted to for example, calculate the the position of an object from the right side of the screen:

offsetRight = document.body.offsetWidth - (offsetX + p.offsetWidth);
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C_J_LAuthor Commented:
Hey, thanks a lot!
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