how to check user belongs to certain group or not in widget

[Ak8977]

I created one widget. In that widget  I need to show some content based on the user group.
if user is a member of one of the following group - xyz, abc, def, jkl. I need to show him some text  else I need to show him another text.

Could someone help me how  I can validate whether the user belongs to one of the group in widget. 
thanks,

[Mark Manders]

Can you share what you already have?

[Ak8977]

I am having the following html code
<div>
<!-- your widget template -->
<h1>We apologize for the inconvenience, but this portal has been permanently closed.</h1>
<h2>Please click <a href="/esc">here</a> to access  "Employee Center" portal </h2>
</div>.

I am having the above code.
if the user is from xyz, abc, def, jkl group. I have to show h1 tag in the above code else I need to show h2 tag.