I would stay away from diet pills. The best thing to do is to change your lifestyle. Exchange that hamburger for a chicken sandwich, eat a salad instead of the fries, switch to drinking water instead of soda. Eat smaller healthier meals 4 to 6 times a day. Add more fruit and veggies to your diet.
Instead of spending your lunch break at the table, take a small walk. Exercise does not require a lot of time, 30 minutes 3 or 4 times a week can work miracles.
These are just a few simple ideas that you can add to your daily routine without much effort.
Here is also a free publication that will give you 101 daily tips for losing weight.
http://confidentlifestyle.com/Documents/101diettips.pdf
Good luck and best wishes.