Return value from a prompt dialog using Javascript

var choice;
choice= prompt("Choose a number between 1 and 5", "1, 2, 3,4 or 5")
switch (choice)
{
case "1":
alert("You typed in a 1");
break;
case "2":
alert("You typed in a 2");
break;
case "3":
alert("You typed in a 3");
break;
case "4":
alert("You typed in a 4");
break;
case "5":
alert("You typed in a 5");
break;
}