Javascript将文本从db转换为超链接

I started exploring ajax, and somehow I'm fine with it, not too hard and not easy just normal. Anyway I am having a difficulty with this project I have. It involves ajax, php, js, mysql. I am actually trying to copy Facebook's tagging style. When you tag someone in a post, the full name turns to a hyperlink that directs to the tag users profile. It's only a minor problem I feel, its just that I am new to JS as well. I did the rest already, but I am having a problem turning the text to a hyperlink with js. I want it in the putin_livesearch() the code. I started exploring ajax, and somehow I'm fine