Inserting html code using JavaScript

[Murali N]

I need to put a navigation bar in plenty of HTML pages and requires a 
lot of time to update navigation bar once a week. Currently, our library 
web site hosted in remote computer as I don’t have much control on over 
it. Could someone help me to insert html code from an external file 
using JavaScript in place of SSI (Server side includes)?

Thanks in advance for your help.
murali