circles being auto resized (shrunken) over time

[econolution]

We have noticed a problem where as the user is entering + saving new circle locations the coordinates are actually being changed until the circle reduces into such a small overlay it isn't clickable any longer nor editable.
Easiest way to reproduce is simply select circle and click on TARGET property.
Problem relates to radius calculation. There is a 1 pixel difference after saving because of rounding operation. If drawn circle has odd width, for example 95px, radius will be calculated as: 95/2 = 47.5 => 47px.
If this was single isolated reduction/resize it would be ok, but when adding 30 circle overlays, by the time you get to the end of adding/saving the first ones are pin points!!
FILE: imgmap/jscripts/imgmap.js

Fix attempted:
if (area.shape == 'circle') {
width = parseInt(area.style.width, 10);

•   var radius = Math.floor(width/2) - 1;
  

•   var radius = Math.max(Math.floor(width/2) - 1, 0);
  

else if (this.areas[id].shape == 'circle') {

•   var radius = Math.floor(width/2) - 1;
  

•   var radius = Math.floor(width/2);
  

  if ((width + (diff)) - 1 > 0) {
  //real resize right
  this.areas[this.currentid].style.top = (top + (-1* diff/2)) + 'px';

•       this.setAreaSize(this.currentid, (width  + (diff)) - 1, (height + (diff)));
  

•       this.setAreaSize(this.currentid, (width  + (diff)) - 1, (height + (diff)) - 1);