Second opinion needed - javascript blocker

I am trying to block javascript from ares of my site that users can change. I am going to use the following code. Can someone give me a second opinion on whether it will work? function stopjavascript($text){ //Stop people from using &whatever; tags, in case they can smuggle javascript in with that $text = str_replace("&","&",$text); //Stop the onmouseover, etc. parameters $text = eregi_replace("on","o-n",$text); //Stop script tags, as well as links to javascript: $text = eregi_replace("script","sc-ript",$text); //Return the edited string return $text; }