Help me in this work.Pls..

Hello all,

I need ur's help in the below work,

I need to made search the DB in incase-sensitive manner and want to highlighted the keyword in the search result in also incase-sensitive .

But for sample i got one result for the keyword 'dvd' and for the other result for the keyword 'DVD'.

In search keyword highlighting i used str_ireplace. But it changed in the result 'DVD' to 'dvd' or 'dvd' to DVD and highlighted.

So i need to made if i search 'DVD' and i want to get the result which is same for 'dvd'. (incase-sensitive search).

And in highlight process if my keyword is 'DVD' means i want to highlight 'DVD' and also 'dvd' in the result.(in case sensitive).

My coding are as follows:

$t=$_REQUEST[txtSearch];//search keyword
	 $searchtxt=stripslashes($_REQUEST[txtSearch]);
	//$searchtxt1=addslashes(htmlspecialchars($searchtxt));
	//echo $searchtxt1=addslashes(htmlspecialchars($searchtxt));
   $sql="SELECT * FROM page_content  WHERE (modelno LIKE '%$searchtxt%') or (prodname LIKE '%$searchtxt%') or (proddesc LIKE '%$searchtxt%') or (prodfeature LIKE '%$searchtxt%') or (prodspec LIKE '%$searchtxt%')";
	$res=mysql_query(getPagingQuery($sql))or die(mysql_error());
	$num=mysql_num_rows($res);
	$i=1;
	if($num!=0)
	{
	while($row=$db->fetch_array($res))
	{
	
	$pname=stripslashes($pname);
	$pdesc=stripslashes($row[proddesc]);
	 $pdesc=str_ireplace($t,"<b><font color=red>".$t."</font></b>",$pdesc);
	echo "<p align='justify'><a href=getcontent.php?mcid=$row[mcid]&scid=$row[scid]><font size='2'><u>$i.$row[modelno].&nbsp;$pname</u></font></a></span><br/><br>$pdesc<br/></p>";
	$i=$i+1;
	}

PHP:

Please help me if u know the answer.