D=`xdrag`
A=`echo "$D" | head -n1 | sed 's/ .*//'`
B=`echo "$D" | tail -n1 | sed 's/ .*//'`
if [ "$A" != "$B" ]; then
  GA=`xgetgeom $A`
  GB=`xgetgeom $B`
  xsetgeom $A $GB
  xsetgeom $B $GA
fi