Remove/Block specific HTML tag

<?php

$string = '<EM>see</EM>  <A href="http://www.epicurious.com/cooking/how_to/food_dictionary/entry?id=1965"><FONT size=-1>CLOUDBERRY</FONT></A>';

$tag = "A";

$regExp = "<" . "$tag" . "[^>]*>";

$string = str_replace("</$tag>", "", $string);
$string = ereg_replace($regExp, "", $string);

echo $string;


?>

Simple Ajax Script

Ajax.js

---

subject_id = '';
function handleHttpResponse()
{
if (http.readyState == 4)
{
if (subject_id != '')
{
document.getElementById(subject_id).innerHTML =
http.responseText;
}
}
}
function getHTTPObject()
{
var xmlhttp;
/*@cc_on
@if (@_jscript_version >= 5)
try
{
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
}catch (e)
{
try
{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}catch (E)
{
xmlhttp = false;
}
}
@else
xmlhttp = false;
@end @*/
if (!xmlhttp && typeof XMLHttpRequest != 'undefined')
{
try
{
xmlhttp = new XMLHttpRequest();
} catch (e)
{
xmlhttp = false;
}
}
return xmlhttp;
}
var http = getHTTPObject(); // We create the HTTP Object

function getScriptPage(div_id,content_id)
{
subject_id = div_id;
content = document.getElementById(content_id).value;
http.open("GET", "server_script.php?content=" + escape(content), true);
http.onreadystatechange = handleHttpResponse;
http.send(null);
}

index.html

<input onkeyup="getScriptPage('output_div','text_content')"
id="text_content" size="40" type="text>

<div id="output_div">
OutPut will get printed here...!
</div>

server_script.php

---

<?php
print 'Content Typed - '.$_GET['content'];
?>