How to get BOLD Text and change color of text in Alert or Confirm box?
var conFrm = confirm("Following List(s) already Sent...!\n<strong>List Name: </strong>"+ss.replace(",","\n<b>Name: </b>")+"\n Do you want to send again...!");
You can't do it. But you can use custom Alert and Confirm boxes.
You can read about some User Interface libraries here:
http://speckyboy.com/2010/05/17/15-javascript-web-ui-libraries-frameworks-and-libraries/
Most common libraries are: