title: Show "Unseen" & "modal" dialog - javascript, jQuery
body: <p>I want to show the "unseen" "modal" dialog in javascript. 
  This sounds weird, but, I want the effect of "modal" dialog, which is to make the background uncontrollable &amp; shadow color. But, I don't want to show the dialog popup window.
  So, I thought if I can do this by showing "unseen", "modal" dialog.
  Is this possible?</p>
  
  <p>I cannot find a similar question &amp; good properties of dialog which can do what I want.</p>