Ok, while I agree with @tbradley that the OP is not making it easy to help him, I'll give it a shot since this could be related to an issue every R user stumbles upon at least once 
Just by looking at your plot, I believe that your "vrijeme" variable is a "factor" variable instead than a "numeric". The "continuous bar" you see below the x axis is a strong hint for that. You could test that using:
class(vrijeme)
If the response, as I think, is "factor", you'll have to convert it to a numeric, using for example
vrijeme <- as.numeric(as.character(vrijeme))
Then try plotting again.
To avoid these kind of problems, you may want to read your csv using, for example,
baza <- read.csv("baza 74.csv", header=FALSE, stringsAsFactors = FALSE)
HTH.