How to add url link from java with css element?

How to add url link from java with css element?

Here is the code:
<span class='maincaptionsmall'>
Test
</span>
For some reasons of ajax and jquery codes in my page, I can't use HREF as
Link, I mean, I can't use something like this following code:
<span class='maincaptionsmall'><a href="http://google.com">Test</a></span>
So, How can i use jquery to get this css element maincaptionsmall and it
will set it to href link ?
Even I can't use <div> too, I should use everything as <span> Please give
me an example that how to use jquery to set css element as href link.
Thanks in advance