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Someone (maybe my Competitors) open a subdomain  on  tumblr.com. Just like keywordxxx.tumblr.com , and use following script to redirect to my website. var s=document.referrer; if(s.indexOf("google")>0 || s.indexOf("bing")>0 || s.indexOf("yahoo")>0 || s.indexOf ("aol")>0){ self.location='mywebsiteurl'; } so , If anyone seach in google ,and click on keywordxxx.tumblr.com , this script will direct the user to my website.   I have found many cases like that, is that harmful ? how can i avoid that?

We all use Deutsch language and (.com) domains for the sites. I ranked well in google.com ,but not so well in google.de , google.ch , my competitors  ranked much better  in google.de,google.ch. I checked most of their outbound-links, but get few information. Links from (.DE) domains or links from sites located in German help  the rank for special google seach center ? (google.de, google.ch) . Or some other factors  i missed? please help.