yes i changed it to this
$postedcontent=$_POST["content"];
$postedtxt = htmlspecialchars_decode($postedcontent, ENT_QUOTES);
mysql_query("INSERT INTO blog(title, content, date, source, source_link,picture) VALUES('$data[title]','$postedtxt','$data[date]','$data[source]','$data[source_link]','$data[picture]')") or die(mysql_error());
and
if($thatblog==""){
$position=50; // Define how many character you want to display.
$post = substr($blogrow['content'], 0, $position);
echo $post;
echo "..."; ?><br/><br/><br/>
<strong><a href="blog.php?blogid=<? echo $blogrow['id'] ?>&article=<? echo $blogrow['title'] ?>" style="text-decoration:none;color:#090"><em><br/>
go to post</em></a></strong>
<?
}else{
$con = wordwrap($blogrow['content'], 64);
echo $con; }
the result is i can now use tags , even embed etc