apps wont load

this is a screen snapshot of the whole screen of my ipod whenever i click on buy song the button goes to halve and i try to click it again and it doesnt do any and now i can buy or download anything!!!1i am really mad!! please help me !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1