📄 popup.js
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// variable to store a window object
var popwin = null;
// a function to open a pop-up window
function open_popup()
{
if(popwin == null)
popwin = window.open( "pop.html", "","top=100,left=80,width=250,height=100,status");
}
// function to close a pop-up window
function close_popup()
{
if(popwin != null){ popwin.close(); popwin = null; }
}
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