textObj.replaceData(offset, count, data);

where:

• offset is a long integer value indicating the offset of the substring to be replaced, in characters, from the beginning of the string.
• count is a long integer value indicating the number of characters to replace, starting from the specified offset.
• data is a string to insert instead of the replaced substring.

Let's create a text node at the document level. We put the following line in the header of this tip:

txtObj = document.createTextNode("Doc JavaScript BiWeekly Columns");

and then let's replace a substring that starts at offset 15 and of length 16, with "Daily Tips". Click this button to make it happen in Netscape 6 (Doc JavaScript Daily Tips). Click in Internet Explorer 5.x and get an error message:

<FORM>
<INPUT TYPE="button" VALUE="Extract a Substring" onClick="javascript:handleClick()">
</FORM>

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