Turn on Jquery after page is loaded

Turn on Jquery after page is loaded

Hi I have an existing web page and want to press a  button and display a
 jquery mobile list field?
 
ie the  web page i have  is quite complex and i try wrapping it in jquery mobile..but no luck..
 
can i some how just use the list field without have to wrap the whole page in jquery..
or turn on jquery after it is loaded...
 
the page is too big to port to jquery i just want to use some of jqueries nicer menus..when required..