function getPositionedEventCoords(evt) {
var elem = (evt.target) ? evt.target : evt.srcElement;
var coords = {left:0, top:0};
if (evt.layerX) {
var borders = {left:parseInt(getElementStyle("progressBar",
"borderLeftWidth", "border-left-width")),
top:parseInt(getElementStyle("progressBar",
"borderTopWidth", "border-top-width"))};
coords.left = evt.layerX - borders.left;
coords.top = evt.layerY - borders.top;
} else if (evt.offsetX) {
coords.left = evt.offsetX;
coords.top = evt.offsetY;
}
evt.cancelBubble = true;
return coords;
}