title: multiple layout through block coding in magento
body: <p>I'm new to magento. I don`t have permission to modify the controller file. So I'm creating new module with block to make my requirement works. Now everything works fine.</p>
  
  <p>But, now based on the condition, i need to load the different layout. (one with left sidebar and another without left sidebar). I have to load the layout xml file through block code.</p>
  
  <p>I don't know how to do with block. Can anyone help me?</p>