If you are doing an Annotation, and selecting "Custom" Annotation Type, you will be given a text box where you have probably put in some HTML to display. As an example, if you are putting in some HTML like this, give the top most tag an id.
<div id="myid">
<p>This is what I want to display in my annotation.</p>
</div>
Then you can create a client script, with whatever condition you want, to display or not display this annotation.
Client Script - would be an onLoad client script.
function onLoad() {
var mine = $('myid'); //This selects the element with the ID you have specified.
//This if statement would be whatever condition you want.
//I specified if "mine" (or the element selected) is there, run my code.
if (mine) {
//This is a simple way to hide the element selected.
mine.hide();
}
}
Hopefully this helps to see it visually
