javascript - Replace image in DIV on Phonegap -

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I write an application in PhoneGap and I need to create a function:

Play button, An image appears in the DIV and after 3 seconds it automatically turns into another image. 

  & lt; Div id = "imgtrening" & gt; & Lt; div class = "cw1a" style = "display: none" & gt; & Lt; Img style = "width: 100%"; Src = "picture / cw1a.jpg" alt = "" & gt; & Lt; / Div & gt; & Lt; div class = "cw1b" style = "display: none" & gt; & Lt; Img style = "width: 100%"; Src = "picture / cw1b.jpg" alt = "" & gt; & Lt; / Div & gt; & Lt; / Div & gt;   
 and after clicking on the button id = "play":  
  document.getElementById ('play'). Onclick = function () {$ ('.cw1a'). CSS ('display', 'block') sleep (3000); $ ('.cw1a'). CSS ('display', 'none') $ ('.cw1b') CSS ('display', 'block')}; Unfortunately, my application waits for 3 seconds and shows the second image (I do not see the animation effect) (sleep has another function 3000 milliseconds): (  
 
 
 This is because  .css ('display', 'block')  or  .css ('display' > 
.

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