Natural order sorting

[KEIII]

Hi guys,

By default it is sorting like this:

Code Select Expand


abc0
abc11
abc120
abc20
abc3



How to fix it to have:

Code Select Expand


abc0
abc3
abc11
abc20
abc120


Thanks
Joomla 2.5.6
Virtuemart 2.0.8

[KEIII]

may be somebody knows where I can find VM2 php code implements sort order?