"Click to show" text at pages
Checkout these modules:

qTip (Stylish jQuery Tooltips):


  qTips are stylish tooltips that can be configured and styled (more to come in later releases) to fit nearly any website's design. You can look at demo here.


Field Tooltips:


  Field Tooltips provides a user interface for adding tooltips to fields. Field Tooltips includes three important features:
  
  
  A simple administration interface for adding tooltips to fields.
  Support for all field types.
  Support for HTML tooltips.
  


Beauty Tips:


  The Beautytips module provides ballon-help style tooltips for any page element by integrating the BeautyTips jQuery Tooltip plugin by Jeff Robbins with Drupal. It provides an API for adding custom beautytips as well as some built-in features. Admins can enable rollover balloon-help style tooltips for text fields within forms. It also supplies hover tips for Drupal help links and advanced help links.
  
  Most importantly, it allows developers to add their own custom beautytips popups to their site without having to delve into jQuery.