I read this on YSlow documentation
If your domain is www.example.org, you can host your static components on static.example.org. However, if you’ve already set cookies on the top-level domain example.org as opposed to www.example.org, then all the requests to static.example.org will include those cookies. In this case, you can buy a whole new domain, host your static components there, and keep this domain cookie-free. Yahoo! uses yimg.com, YouTube uses ytimg.com, Amazon uses images-amazon.com and so on.
How can i use that method for my website.
Grade F on Use cookie-free domains
There are 107 components that are not cookie-free
http://www.miraclesoftware.in/csc/skins/basic/customer/styles.base.css<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/styles.css<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/print.css<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/dropdown.css<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/addons/buy_together/styles.css<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/addons/knowledge_base/css/styles.css<br />
http://www.miraclesoftware.in/csc/lib/autocomplete/autocomplete.css<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/addons/tags/styles.css<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/addons/product_configurator/styles.css<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/addons/news_and_emails/styles.css<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/addons/polls/styles.css<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/addons/discussion/styles.css<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/addons/hot_deals_block/styles.css<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/addons/my_changes/css/local_styles.css<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/css/droplink.css<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/css/megadropdown.css<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/css/readmytweet.css<br />
http://www.miraclesoftware.in/csc/lib/jquery/jquery.js<br />
http://www.miraclesoftware.in/csc/js/ajax.js<br />
http://www.miraclesoftware.in/csc/addons/buy_together/js/func.js<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/js/readmytweet.js<br />
http://www.miraclesoftware.in/csc/js/swfobject.js<br />
http://www.miraclesoftware.in/csc/js/exceptions.js<br />
http://widget.uservoice.com/images/clients/widget2/tab-horizontal-dark.png<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/images/icons/select_icon.gif<br />
http://www.miraclesoftware.in/csc/js/core.js<br />
http://www.getresponse.com/javascripts/core/webforms/webform-out.js?...<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/images/sbbar.jpg<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/images/cart_combined_button.png<br />
http://www.getresponse.com/images/core/webforms/gradient_middle.png<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/images/icons/icon_close.gif<br />
http://www.miraclesoftware.in/csc/facebook_32.png<br />
http://www.miraclesoftware.in/csc/twitter_321.png<br />
http://www.miraclesoftware.in/csc/rss_32.png<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/images/btn-viewcart.png<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/images/btn-checkout.png<br />
http://www.miraclesoftware.in/csc/dicountbanner.jpg<br />
http://www.miraclesoftware.in/csc/likefacebook.jpg<br />
http://www.miraclesoftware.in/csc/images/thumbnails/4/120/150/30448_30447_whitesmoke13072566764deb2764ae9a3.jpg<br />
http://www.miraclesoftware.in/csc/images/thumbnails/4/120/150/samb1930nd.jpg<br />
http://www.miraclesoftware.in/csc/images/thumbnails/4/120/150/crashplanpro.png<br />
http://www.miraclesoftware.in/csc/images/thumbnails/4/120/150/tc18delpaclftx500.jpg<br />
http://www.miraclesoftware.in/csc/images/thumbnails/4/120/150/norton360412706216134bbc25ad7d208.jpg<br />
http://www.miraclesoftware.in/csc/images/thumbnails/4/120/150/win7hppctisbundle.jpg<br />
http://www.miraclesoftware.in/csc/images/thumbnails/4/120/150/FIS2011.jpg<br />
http://www.miraclesoftware.in/csc/images/thumbnails/4/120/150/30348_SM_boxshot_left.jpg<br />
http://www.miraclesoftware.in/csc/images/thumbnails/4/120/150/TuneUp_Utilities_2010.jpg<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/images/prod_block_tl.gif<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/images/prod_block_tr.gif<br />
http://www.miraclesoftware.in/csc/images/thumbnails/4/70/70/trustwavessl.jpg<br />
http://www.miraclesoftware.in/csc/images/thumbnails/4/70/70/versignsecurepro.jpg<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/images/prod_block_bl.gif<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/images/prod_block_br.gif<br />
http://www.miraclesoftware.in/csc/images/thumbnails/4/70/70/verisignsslevpro.png<br />
http://www.miraclesoftware.in/csc/images/thumbnails/4/70/70/verisignbox13038856384db7b7464b082.png<br />
http://www.miraclesoftware.in/csc/images/thumbnails/4/70/70/verisignsslev.png<br />
http://www.miraclesoftware.in/csc/feedback.png<br />
http://www.miraclesoftware.in/csc/eagames1.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/pctools_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/kaspersky_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/ms_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/evermotion_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/mcafee_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/avast_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/adobe_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/apexsql_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/avg_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/bitdefender_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/busy_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/cg-academy_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/corel_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/eset_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/fsecure_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/geotrust_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/iolo_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/nuance_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/quickheallogo.gif<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/soliddocuments_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/sqlmanager_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/strata_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/symantec_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/thawte_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/trustwave_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/trendmicro_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/turbocad_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/verisign_logo.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/whitesmoke_logo.jpg<br />
http://www.miraclesoftware.in/csc/visa.png<br />
http://www.miraclesoftware.in/csc/mastercard.png<br />
http://www.miraclesoftware.in/csc/paypalcurved.png<br />
http://www.miraclesoftware.in/csc/westunion.png<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/images/bg/miraclebgcolor.jpg<br />
http://www.miraclesoftware.in/csc/skins/basic/customer/images/MiracleSoftwC80a-A01aT01a-Z_mdm.jpg<br />
http://www.miraclesoftware.in/csc/office2007training.jpg<br />
http://www.miraclesoftware.in/csc/amd965bebanner.jpg<br />
http://www.miraclesoftware.in/csc/tfpp15.jpg<br />
http://www.miraclesoftware.in/csc/sapphire57701gb.jpg<br />
https://www.miraclesoftware.in/csc/skins/basic/customer/images/logo/tally_logo.jpg<br />
http://www.miraclesoftware.in/index.swf?...<br />
http://www.miraclesoftware.in/csc/callus.jpg<br />
http://widget.uservoice.com/dcache/widget/feedback-tab.png?...<br />
http://widget.uservoice.com/PSzYm7thXTQyWCHmPkUYw.js<br />
http://www.getresponse.com/images/core/webforms/lock.png<br />
http://www.miraclesoftware.in/csc/styles.css<br />
https://chatserver.comm100.com/BBS.aspx?...<br />
http://www.getresponse.com/view_webform.js?...<br />
http://www.getresponse.com/images/core/webforms/countertemplates.png