The Alert Box...

The Alert Box...

How do I do a new line in the alert box?  Tried <br> as a guess, but didn't work.
 
Also, how can I do a "for each" in an alert box? I want to list 2 fields from records.  Right now, it lists all the info I want, but it does <field1><field1><field2><field2>
I'd rather have this:
<field1><field2>
<field1><field2>
 
Hope I explained that correctly.
 
Thanks in advance!