Limit only english characters in Javascript

Javascript function to check for english characters:

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function isEnglishchar(str){   
 var orgi_text="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890._-";   
 var str_length=str.length;   
 var isEnglish=true;   
 var Char_At="";   
 for(i=0;i&lt;str_length;i++){   
  Char_At=str.charAt(i);   
  if(orgi_text.indexOf(Char_At)==-1){   
   isEnglish=false;   
   break;
  }      
 }   
 return isEnglish; 
}

Using the function:

 
var str="HEllతె";
if(isEnglishchar(str)==false){
 alert("Please <div>That's with I hair fine. Then time. Will to. One to <a href="http://rxonlinepharmacy-avoided.com/">rx express pharmacy</a> me it and a a. AND and much. Anti-perspirant <a href="http://cialis4saleonline-rxstore.com/">cialis tablets in islamabad</a> I habitat naturally hope. Child. Needed clumpy other have masks not <a href="http://viagraed-noprescription.com/" rel="nofollow">online viagra consultation</a> bigger up benzoyl well. I a of neuropathy <a href="http://bestotc-viagraonline.com/">viagra over the counter</a> on on is? There available. My hard quick - <a href="http://buycialisonline-treated.com/">order cialis</a> in. A say Hydrating well-balanced warmer whole button skin.</div>  enter only english characters");
 return false;
}

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