can anyone explain what are the differences between bipolar disorder and depression?? 
i google it, and this is what i got..i think its not reliable enuff..hehehehe.. 

Bipolar disorder is an illness that consists of alternating periods of elevated moods, called manic episodes, and depression. Mood swings run on a spectrum from mild mania (called hypomania) to more severe, debilitating highs. Periods of mania can last for hours, days, weeks or even months before the person plunges back into depression.

Unfortunately, bipolar disorder is commonly misdiagnosed as depression because the manic symptoms--such as increased energy, heightened mood and increased sex drive--have a positive effect on the patient. It feels good so it's not perceived as a problem. The low periods of depression are generally what first bring a patient in for help.

Untreated or improperly treated bipolar disorder can have serious consequences for the patient. Mania can lead to poor decision making and impulsiveness that can wreak havoc in a person's life. Properly treated, however, a person with bipolar disorder can lead a peaceful and productive life without the extremes of mood.