How to set default resolution in XF86?

[Tracy Nelson]

Whenever I start X, it comes up with a default resolution of (I think) 640x480.  I normally run at 1280x1024, which means I have to hit <CTRL><ALT><KP+> two or three times to select the correct resolution.  Is there any way I can specify that as the default resolution?  Is it a matter of just resequencing some lines in my XF86Config file?   I'd also like to use a resolution of 1152x870, but that resolution wasn't provided under xf86config.  Is there some way I can calculate the vertical and horizontal frequencies for this resolution and add them to my XF86Config file?  1280x1024 is a little much for my .31DP monitor...   Thanks! -- Tracy Nelson