image thumb shrink / bad cropp

With the thumbs on the left side its like the Heighth its cropped and the Width shrinks.

This is the link:
http://www.punkska.com.ar/punkska3/

CSS
.postim {
background:none repeat scroll 0 0 #222222;
border:0 solid #454B4F;
float:left;
margin:0 10px 10px 0;
padding:9px;
width:140px;
heighth:100px;

Printscreen from the Media Settings:
http://www.punkska.com.ar/punkska3/wp-content/uploads/2010/10/punkska_fotos.png

I dont know how to fix this
please help me, thanks a lot!
JP