myselfmusa5

hi, i am building a website and i have an option for uploading photos on it.but i am not understanding if the photo size is too big... then when i view the photo it will be screening very big.....Is there any option for resizing the photo using javascript or php or anything.. just like facebook does... when any one uploads a photo the facebook auto adjusts the picture on viewing frame.. how can i do this?can any one help? plzzz...