connect stereo cassett player to my dell N5010

Connect a cable between the output jack(s) of the cassette player and the audio input jack on the left side of the computer. I don't know what kind of jacks your player has so I cannot say exactly the kind of cable you need. If it has RCA jacks then obviously you will need an adapter, or you could use the headphone jack of the player as the output jack.

The stereo cassette player RCA output jacks on it, the only audio input that I have on my dell n5010 laptop is the microphone input, is that where I connect cassett player?

The stereo cassette player RCA output jacks on it, the only audio input that I have on my dell n5010 laptop is the microphone input, is that where I connect cassett player?

You need something like this --->   http://www.radioshack.com/product/index.jsp?productId=3240426

Jim,

If you do not need top quality then you can get it quite a bit cheaper, for example at amazon.com:

http://www.amazon.com/Belkin-Audio-Cable-Splitter-1-Mini/dp/B00004Z5CP