How to do simple jquery alert window? -

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I have tried the following for a simple query warning popup but always receives the error that the object does not support the property /way. Any thoughts that I am doing wrong? 

  & lt; Script & gt; $ (Function () {("#hello"). Show ()}); & Lt; / Script & gt;   
 and  
  & lt; Script & gt; $ (Function () {("#hello") dialog ()}); & Lt; / Script & gt;   
 HTML  
  & lt; div id = "hello" & gt; testing. & Lt; / Div & gt;    
 
 
 You can enter  $  symbol ( JQuery ) As well as the  jQuery UI  library  
 
 
  & lt; link Href = "http://code.jquery.com/ui/1.9.2/themes/base/jquery-ui.css" rel = "stylesheet" /> & gt; script src = "https: // ajax .googleapis.com / ajax / libs / jquery / 2.1.1 / jquery.min.js "& gt; & lt; / script & gt; & lt; script src =" http://code.jquery.com/ui /1.9.2/jquery-ui.js ">  
 test       

 




  






























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