I am no expert, but you can use the ::before/after with content. . Not sure how older browsers handle it, but you would do:

HTML

<p class='cool' >Last Updated </p>

CSS

p.cool::after {
content: "January 10, 2012" ;
color: red; 
.....
}

>#footer {
> clear:both;
> width: 826px;
> height: 50px;
> background: rgb(0%, 80%, 40%);
> padding: 5px;
> margin: 0;
>line-height: 50px;
>}




>Dear Experts
>
>I have followin codes
>
>
>CSS
>

>#footer {
>	clear:both;
>  width: 826px;
>  height: 50px;
>  background: rgb(0%, 80%, 40%);
>  padding: 5px;
>  margin: 0;
>line-height: 50px;
>}
>

>
>HTML
>
>

><div id="footer">
>Last Updated : January 01, 2012
>  </div>
>

>
>Footer tags is included in all 5 pages, When I update any page then I have to edit this line
>
>Last Updated : January 01, 2012
>
>in all pages
>
>Is there a way to create variable to store last updated value.
>Then this value must show in the footer div of every page.
>
>Please help