Put a message in top of the page with jQuery

[javascript]
function messageAjax (msg) {
if (jQuery("body").find("#infoBox").length == 0) {
jQuery("body").prepend("<div id=\"infoBox\" style=\"height: 20px;background-color:#ffffff;width:100%;display:none;text-align:center;border-bottom:#2BBAE4 1px solid;\"></div>");
} // END IF

jQuery("body").find("#infoBox").text(msg).slideDown().delay(3000).slideUp();
}
messageAjax(‘I m on top of everything’);
[/javascript]