If you are wanting to add some text to the cart overlay screen itself, then you can add the following lines to your View Cart code (assuming you are using our standard View Cart code) on each page, just before the "// -->" line:
function EJEJC_config() {
EJEJC_POSTCALL=true;
}
function EJEJC_shown() {
jQuery("#tdPmnt").attr("innerHTML",
"Anything <b>HTML</b> you want to show in cart goes here, all on one long line");
}
(BTW, if you had already added EJEJC_config(){} previously, do not duplicate it, but just modify what you had added to include any new lines shown above.)