Avatar size too small

When I link to website avatars, the avatr size decreases drastically in size. How do I change the policies of Avatar sizes? Thanks.

It's different than what you think. The proportionality of each picture changes as well. I linked to a picture of 107 x 83 and it changed into a 64 x 64. I'm not ok with it changing the proportionality. I'd like that ratio to stay the same. Is there a way to do this for ALL avatars for ALL members? I didn't find this on a search.

<script language="javascript" type="text/javascript">
<!--
function resizeAvatar(avatar) {
     // width & height can be different e.g. 150/100
     var width = 150;
     var height = 150;
     var rw = avatar.width/width;
     var rh = avatar.height/height;

     if (rw > 1 || rh > 1) {
          var ratio = avatar.width/avatar.height;

          if(rw > rh) {
               avatar.sty le.width = width;
               avatar.sty le.height = width / ratio;
          }
          else if(rw < rh) {
               avatar.sty le.height = height;
               avatar.sty le.width = height * ratio;
          }
          else {
               avatar.sty le.width = width;
               avatar.sty le.height = height;
          }
     }
     else {
          avatar.style.width = avatar.width;
          avatar.style.height = avatar.height;
     }
}
//-->
</script>