Macbook pro 13" and external monitor question

Hi,
I got a mbp 13" 2010
I would like to buy a HP 2510i monitor http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02076507 &lang=en&cc=us&taskId=115&contentType=SupportFAQ&prodSeriesId=3757979&prodTypeId =382087
Today I brought my macbook to a computer store and connected it to a samsung monitor 27" using mini-display to hdmi cable.
When i mirrored the screens I got two black areas on the left and right. basically it wanst fullscreen. (macbook res is 1280x800, so I think I got the same resolution on the external monitor)
But when I disable the mirror option Its all good and supports 1080p resolution.
How can I get fullscreen(1080p) even when I am mirroring the screen? will this hp monitor be able to do this?
thanx

You can change your screen resolution by going to system preferences and displays from there you can select the bes resolution. However you will never get is perfect as the ratio is different from your ho screen to your mac. You could either go without mirroring (what I do with my cinema display) or plug it into your screen and then shut your mac lid so the dock moves onto the ho screen and it becomes your only display. You would however need an external mouse and keyboard to control this.

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