1.Login to your Bogger Dashboard and go to Design >> & Page Elements.
2.Click on 'Add a Gadget' on the sidebar.
3.Select 'HTML/Javascript' and add the one of code given below
<script type="text/javascript">
<!--
function myPopup2() {
window.open( "YOUR URL HERE", "myWindow",
"status = 1, height = 300, width = 300, resizable = 0" )
}
//-->
</script>
</head>
<body>
<form>
<input type="button" onClick="myPopup2()" value="POP2!">
</form>
<p onClick="myPopup2()">Click This</p>
Note: Replace YOUR URL HERE with your pop up windows link
4. Now Click on Save "Html Java Script" and You are done..

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