Creating the list 1.2 . 4.5
head = new Node ( 1 ) ; head . next = new Node ( 2 ) ; head . next . next = new Node ( 4 ) ; head . next . next . next = new Node ( 5 ) ; document . write ( " " + " " ) ; display ( ) ; var x = 3 ; insertAtMid ( x ) ; document . write ( " " + " " ) ; display ( ) ;