Empty squares or pads appear when modifying event module Calendar

The event calendar block is rendered by the normal calendar month function. Now i'm trying to make calendars interface horizontally aligned like here: http://www.davidbowie.com/news/

Almost everything works fine, but after modifying the css there still appears these "empty squares" to calendar navigation. In event.module source these "squares" are called "pads".

Mr. Killesreiter sayd, that i need to have a function "mytheme_event_calendar_month" that does
format the content not into an array of days, but into a flat line.

Could someone help me with this?