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<html><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Keywords" name="Keywords"content="JavaScript, examples, JavaScript: The Definitive Guide"><title>Example 20-6 from JavaScript: The Definitive Guide, Fifth Edition</title><style>body { font-family: arial, sans-serif}.lefttitle { font: bold x-small arial, sans-serif; margin: 5px; letter-spacing: .15em; text-transform:uppercase;}.leftcaption { font: italic x-small sans-serif; margin-bottom: 20px;}#banner { font-family:sans-serif; color:#333; font-size:x-large; font-weight:normal; padding:15px; padding-top: 3px; border-bottom:4px double #666;}#banner h1 { font-size: x-large; margin: 0px; padding: 0px;}#banner .description { font-size:large; margin-left: 2px;}pre { border: solid black 1px; background-color: #ddd; padding: 10px; margin: 0px;} </style></script></head><body><div id="banner"><h1>davidflanagan.com/javascript5</h1><span class="description">Example 20-6 from<i>JavaScript: The Definitive Guide, Fifth Edition</i></span></div><div style="float: left; text-align: center; width:200px; margin-right:20px"><div class="lefttitle">Buy The Book</div><iframe src="../../rcm.amazon.com/e/cm-t=davidflanagancom&o=1&p=8&l=as1&asins=0596101996&fc1=000000&IS2=1<1=_blank&lc1=0000ff&bc1=000000&bg1=ffffff&f=ifr" tppabs="http://rcm.amazon.com/e/cm?t=davidflanagancom&o=1&p=8&l=as1&asins=0596101996&fc1=000000&IS2=1<1=_blank&lc1=0000ff&bc1=000000&bg1=ffffff&f=ifr" style="width:120px;height:240px;" scrolling="no" marginwidth="0" marginheight="0" frameborder="0"></iframe><div class="leftcaption">This example is posted here for the convenienceof my readers.</div><div class="lefttitle">Tip the Author</div><form action="https://www.paypal.com/cgi-bin/webscr" method="post"><input type="hidden" name="cmd" value="_s-xclick"><input type="image" src="../../www.paypal.com/en_US/i/btn/x-click-but21.gif" tppabs="https://www.paypal.com/en_US/i/btn/x-click-but21.gif" border="0" name="submit" alt="Make payments with PayPal - it's fast, free and secure!"><img alt="" border="0" src="../../www.paypal.com/en_US/i/scr/pixel.gif" tppabs="https://www.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1"><input type="hidden" name="encrypted" value="-----BEGIN PKCS7-----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-----END PKCS7-----"></form><div class="leftcaption">Found a helpful example, but don't own the book?</div><div class="lefttitle">Advertising</div><script type="text/javascript"><!--google_ad_client = "pub-5162555666633441";google_alternate_color = "ffffff";google_ad_width = 160;google_ad_height = 600;google_ad_format = "160x600_as";google_ad_type = "text_image";google_ad_channel ="";//--></script><script type="text/javascript" src="../../pagead2.googlesyndication.com/pagead/show_ads.js" tppabs="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script></div><div style="margin-left: 220px;"><div class="lefttitle" style="padding:0px; text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><pre>HTTP._getResponse = function(request) { // Check the content type returned by the server switch(request.getResponseHeader("Content-Type")) { case "text/xml": // If it is an XML document, use the parsed Document object return request.responseXML; case "text/json": case "application/json": case "text/javascript": case "application/javascript": case "application/x-javascript": // If the response is JavaScript code, or a JSON-encoded value, // call eval() on the text to "parse" it to a JavaScript value. // Note: only do this if the JavaScript code is from a trusted server! return eval(request.responseText); default: // Otherwise, treat the response as plain text and return as a string return request.responseText; }};</pre><div class="lefttitle" style="padding:0px; text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><p><script type="text/javascript">amazon_ad_tag="davidflanagancom"; 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