Zjištění absolutní pozice prvku

// works in IE and Mozilla.

function getElementPosition(element){

      var x=0,y=0;

      while (element!=null){

      x+=element.offsetLeft-element.scrollLeft;

      y+=element.offsetTop-element.scrollTop;

      element=element.offsetParent;

      }

      return {x:x,y:y};

}



// Browser compatible element getter

function getElement(id){

      if (document.all)

      return document.all[id];

      if (document.getElementById(id))

      return document.getElementById(id);

      return null;

}



// generic display function

function findElement(id){

      // Get the element by its id

      element = getElement(id);

      // make sure that the element was found

      if (! element) return;

      // get the object that will contain the x,y coordinates

      return position = getElementPosition(element);

}





// pozice obrazku

var pozice = findElement('obrazek'); // obrazek = id elementu

var poz_x = pozice.x;

var poz_y = pozice.y;