Today I worked with adding a button on simple editor of wordpress which will take your input using javascript prompt function, process it and then add it to the editor itself. While searching in net, I got it working very cool. All you have to do is run a javascript query which will do some DOM operation on wordpresse’s admin section. This one helped a lot, I just simplified it in my code below

<?
add_action('admin_footer', 'wpaq_addsome');

function wpaq_addsome(){

		echo <<<EOT
				<script type="text/javascript">
					<!--
						if(wpaqToolbar = document.getElementById("ed_toolbar")){
							var wpaqNr, wpaqBut, wpaqStart, wpaqEnd;
EOT;
			echo <<<EOT
							wpaqNr = edButtons.length;
							edButtons[wpaqNr] = new edButton('ed_wpaqNew','New','', '','');
							var wpaqBut = wpaqToolbar.lastChild;
							while (wpaqBut.nodeType != 1){
								wpaqBut = wpaqBut.previousSibling;
							}
							wpaqBut = wpaqBut.cloneNode(true);
							wpaqToolbar.appendChild(wpaqBut);
							wpaqBut.value = 'Add some Value';
							wpaqBut.title = wpaqNr;
							wpaqBut.onclick = someFunction;
							wpaqBut.id = "ed_wpaqFlake";
EOT;

echo
	function someFunction() {
	myField = document.getElementById('content');
	var myValue = prompt('Enter the value:', '');
	if (myValue) {
		edInsertContent(myField, myValue);
	}
}
				</script>
EOT;
}
?>