adjust resolution

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http://askubuntu.com – I face with a big problem , I bought a monitor that it supports at last 1280x960 resolution and i create an application on Ubuntu in 1280x1024 resolution,it takes time to finish it so in this case i should adjust and fit my screen on Ubuntu with this lower resolution, when my system boot via 19 inch monitor that has my suitable resolution , it detects and set this resolution and it comes up , I change monitor with the lower one and it fits screen too but when i reboot system it change setting via the low graphic monitor and it makes trouble for me , so if you know a way to resolve this problem (HowTos)