Add an information message in CRM form

With the following script, you can add an information message to a CRM form

var newcontent = document.createElement("div");
newcontent.id = "message";

newcontent.style.border = "solid 1px black";
newcontent.style.marginLeft = "10px";
newcontent.style.marginRight =
"10px";
newcontent.style.marginTop = "0px";
newcontent.style.marginBottom = "4px";
newcontent.innerHTML =
"<table border="'0'" cellspacing="'0'"
cellpadding="'4'"><tr><td
style='width:20px;background-color:#FFFFAE'><img
src="'/ico/16_info.gif'/" /></td><td
style='font-family:Tahoma;font-size:11px;padding-left:8px;background-color:#FFFFAE;width:100%'>This
is an information
message.</td></tr></table>";

var scr = document.getElementById(elementId);
scr.insertBefore(newcontent, scr.firstChild);

Juste replace elementId with:
"areaForm" to place the message on top of tabs
"tabX" to place the message in the tab X (X is the index of the tab)

[UPDATE]

Si had put a easier and more integrated solution in the comments. So I put his solution right here to avoid further navigation. Thank you, Si!

Nice, just used this but you can see from the screen shot that inserting
the div as the first child of areaFrom makes the bottom of the form disappear,
you can't see the bottom of the scoll bar is not visible.
I've checked the form dom and there's a nice div called Navigation that is
already styled with a yellow backgroundHere's your code altered slightly that
allows CRM to format the screen correctly, it can also be called multiple times
and will update the text.

var sText = 'Hello World!';
var elementId = 'Notifications';
var id = 'divMessage';
var src = document.getElementById(elementId);
var newcontent = document.createElement("span");
newcontent.id = id;
newcontent.innerHTML = "<table><tbody><tr><td><img src="/_imgs/ico/16_info.gif" /></td><td valign="'top'">" + sText +
"</td></tr></tbody></table>";
src.style.display = "";
var previous = src.firstChild;
if (previous == null previous.attributes['id'].nodeValue != id)
{
if (src.childNodes.length == 0)
src.appendChild(newcontent);
elsesrc.insertBefore(newcontent, src.firstChild);
}
else
src.replaceChild(newcontent, previous);