help with transistor

could any 1 pls help me & explain what the collecter,base & emmiter actually do on a transistor.

Have a look at this page
**broken link removed**
there it's all explained nicely.

TRANSISTORS

THE BASE ON THE TRANSISTOR IS WHERE YOU HAVE A SET VOLTAGE, FOR EXAMPLE THIS IS 5V. YOU INJECT A SIGNAL IN THROUGH THE BASE AND THE VOLTAGE IS COMPARED TO THAT COMING FROM THE EMMITTER AND THE RESULT IS AMPLIFIED WHICH COMES OUT THE COLLECTOR. BUT THERE ARE MANY OTHER USES FOR TRANSISTORS BESIDES APLIFICATION

thanxs alot 8)