where does it call a pop up?

i am trying to find in this code where it instructs a new browser window?

<div id="mlcalc-w1">
<div id="mlcalc-w2">
<div id="mlcalc-w3">
<div id="mlcalc-w4">
<div id="mlcalc-w5">
<link rel="stylesheet" type="text/css" media="screen,projection" href="http://www.mortgageloan.com/sites/all/themes/mortgageloan/css/tool/mlcalc-inline.css">
<div id="mlcalc-pres">
<h2 id="mlcalc-head">
<em>19 Mortgage Calculators</em&g开发者_JS百科t; <em><a href="http://www.mortgageloan.com/widgets/#tool-num-4" rel="nofollow" target="_blank">Get this Widget</a><span></span></em>
</h2><iframe id="mlcalc-calc" src="http://www.mortgageloan.com/tool/mortgage/mortgage-calculator-package-content" scrolling="no" border="0" frameborder="0"></iframe>
<p id="mlcalc-footer">
Related Resource: <a href="http://www.mortgageloan.com/">Refinance &amp; Mortgage Rates</a>. Calculator © MortgageLoan.com.
</p>
</div>
</div>
</div>
</div>
</div>
</div>

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see the target="_blank" attribute of your anchor.

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See the target="_blank" part in your code, it tells the browser to open the link in a new window.