Magento. Insert block into another without change template code

Question

I\'ve tried to find solution but with no results. My task is to write module. It should insert some html into existing block.

I noticed that when I used layout .xml file

Answer 1

I found an elegant solution using Observer and wrote a post on the company blog: http://www.fxplabs.com.br/blog/instanciando-blocos-em-qualquer-lugar-magento/

translation to english:

http://translate.google.com/translate?sl=pt&tl=en&js=n&prev=_t&hl=pt-BR&ie=UTF-8&eotf=1&u=http%3A%2F%2Fwww.fxplabs.com.br%2Fblog%2Finstanciando-blocos-em-qualquer-lugar-magento%2F