JavaScript/REGEX: Validate email addresses separated by commas, allowing for whitespace

Using regular expressions with JavaScript, how can I validate email addresses seporated by spaces, with any amount of whitespace before or after the email addresses?
var e = ' ,   , ';
if(/^([a-z0-9_\-\.])+\@([a-z0-9_\-\.])+\.([a-z]{2,20})(,([a-z0-9_\-\.])+\@([a-z0-9_\-\.])+\.([a-z]{2,20}))*?$/ig.test(e) == false) alert('Fail');
else alert('pass');

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var e = ' ,   , ';
if(/^\s*([a-z0-9_\-\.])+\@([a-z0-9_\-\.])+\.([a-z]{2,20})(\s*,\s*([a-z0-9_\-\.])+\@([a-z0-9_\-\.])+\.([a-z]{2,20}))*?\s*$/ig.test(e) == false) alert('Fail');
else alert('pass');

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