For elements that are or descent from elements that are position:fixed, getPositionLite returns the values they would have if they were position:absolute. I believe this is also true of getPosition itself.

Here is a fix that's working for me:

getPositionLite : function(el)

{

var x = 0, y = 0;

var fixed;

while(el) {

if (jQuery(el).css('position') == 'fixed') {

fixed = true;

}

x += el.offsetLeft || 0;

y += el.offsetTop || 0;

el = el.offsetParent;

}

if (fixed) {

if (window.pageXOffset != null) {

x += window.pageXOffset;

y += window.pageYOffset;

} else {

x += document.body.scrollLeft;

y += document.body.scrollTop;

}

}

return {x:x, y:y};

},

This patch solves the position:fixed problems with idrop.js.