From http://www.w3schools.com (Copyright Refsnes Data)

WMLScript insertAt() Function


WMLScript String Library Complete WMLScript String Library

The insertAt() function divides a string into elements and inserts a substring at the specified index position.

Syntax

n = String.insertAt(string, substring, index, separator)

Part Description
n The string returned from the function
string The original string
substring The substring to be inserted into the original string
index An integer that specifies where to insert the substring
separator The dividing separator

Example

var a = String.insertAt("Visit W3Schools!","us at",1," ");

Result

a = "Visit us at W3Schools!"


WMLScript String Library Complete WMLScript String Library

From http://www.w3schools.com (Copyright Refsnes Data)