maximizer help

I'm trying to run 2 wow windows at once, and using a batch file this is what i have so far after reading some info on maximizer:

copy "C:\program files\selero\WTF\2_boxing.wtf" "C:\program files\selero\WTF\config.wtf"
"c:\Program Files\selero\maximizer.exe" --margin 0,300,0,0
"c:\Program Files\selero\maximizer.exe" --margin 300,0,0,0

Both of my wow windows pop up and get into position but they overlap each other by alot, its like each one takes about 3/4 of my monitor, yet i want it to take half. IF anyone can help me out here =D that'd be awesome