how to use focus function javascript

 focu()  function  is use in javascript for focus of input box when you enter any wrong values in inputbox
for example email , mobile number .. etc

example :function emailvalidation(){ var emailPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/; email = document.getElementById(’email’).value ; if(emailPattern.test(email)==false){ alert(‘please Enter Valid Email Id’); document.getElementById(’email’).focus(); return false ; } }
Email Id :
when you enter wrong email them your cursor blink on input box

 code : in javascript  document.getElementById(’email’).focus();

in jquery    $(‘#email’).focus() ;   where email s id of input box

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