var correctchoices=new Array()
correctchoices[1]='a'
correctchoices[2]='c'
correctchoices[3]='b'
correctchoices[4]='d'
correctchoices[5]='b'
correctchoices[6]='d'
correctchoices[7]='c'
correctchoices[8]='b'
correctchoices[9]='c'
correctchoices[10]='d'