UIWebView and click link

UIWebView and click link

I know that most likely the answer is very obvious, but I've looked
everywhere on the internet and I have not found anything. I use this
method to see if the user presses on the WebView
-(BOOL)webView:(UIWebView *)webView
shouldStartLoadWithRequest:(NSURLRequest *)request
navigationType:(UIWebViewNavigationType)navigationType; {
I can assure you that it works.
What I want to do is to make different actions according to the id
es
<a id="hello" href="..."><img src="..." /></a>
once the delegate detect "touch click" on the img with the "hello" id, I
would do some custom stuff, like [self callSomething];
Could you show me how to do it using a sample code? thanks