restrict the resizing

How to restrict the resizing while moving the column into right side.

Did not try this, but the first idea is to put all genresize.js code on the page and create activate / deactivate resizing buttons with last lines:
document.onmousedown = doDown;
document.onmouseup = doUp;
document.onmousemove = doMove;
And for deactivate ="" or null (maybe needs to capture those events first and then restore).

Found that replacing genresize.js lines:

el = event.srcElement;

if (el.className == "resizeMe") {
str = getDirection(el);
//Fix the cursor 
if (str == "") str = "default";
else str += "-resize";
el.style.cursor = str;
}
  with :

if (this.className == "resizeMe") {

el = event.srcElement;

str = getDirection(el);
//Fix the cursor 
if (str == "") str = "default";
else str = "move";
el.style.cursor = str;
}

  Solve the Mozilla "resize column to right direction" issue, but looses the ability to know when mouse over borders and also corner cursor modes.
HTH