Just a wrapper around boxplot function. To set which level is plot first, consider using the function factor and set the argument levels.
| 1 2 3 4 | 
| data | data.frame with the data | 
| dv | Dependent variable. The one you want on the y-axis | 
| iv1 | First independent variable | 
| iv2 | Second independent variable | 
| colors | Colors of the bars of the boxplot | 
| ylim | Limit of y axis | 
| ylab | Label of y axis | 
| outma | outma for setting par | 
| margin | margin for setting par | 
| mgp | mgp for setting par | 
| legend.text | Text for the legend | 
| legend.color | List of color for the legend | 
| legend.xy | x and y position of the legend | 
| ... | passed to graphics::boxplot function | 
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