title: making a textbox visible depending on Dropdown list selection
body: <p>I have a dropdownlist with options and the last option is Other. If the user selects Other I have to make a text box visible.</p>
  
  <p>I did it using asp.net and made the autopostback=true for ddlchanged event. When I follow this when ever the user selects other the page flickers and going to the top.</p>
  
  <p>somebody told me that I can use jquery to do it with out loading the page again. can you tell me how?
  Also it should also check the required field validation.</p>