gistfile1.sh

#!/bin/bash
for ((  i = 500 ;  i <= 540;  i= i +10 ))
do
  sleep 1
  xte "mousemove 500 $i" "mousedown 1" "sleep 2" "mouseup 1"
  xte "mousemove 500 440" "sleep 1" "mouseclick 1"
done    

for ((  j = 552 ;  j <= 540;  i= j +10 ))
do
  sleep 1  
  xte "mousemove 500 $j" "mousedown 1" "sleep 2" "mouseup 1"
  xte "mousemove 500 440" "sleep 1" "mouseclick 1"
done