This is the IFrame tutorial.IFRame is mainly used for people whose servers that cannot support SSI so this is the basic code
Once you are done with that paste in it your site and adjust the setting
Then you make a page for your site say with just a left toolbar called left.html then you would put left.html in the code and paste the code on all pages and POOF!! all you have to do is update one page and all th others update too.
Note:This is Extremely useful and so is SSI