How to Set Smiles like in this discussion form.

Hello,
I m creating something in which i have to give space to writedown some comments and in which i want to show smiles like in this discussion form.
Please help me to writedown code

 

I would prefer str_replace()

 

I didn't mean that. I want to create like editor in which i want to display smiles.

 

Use javascript on the smiley links to add the smiley to the textbox, then use str_replace() when you're displaying the comment on the page, to replace the smiley with the image.