[Javascript] js for inserting a \n every 80 chars?

[Matt Murphy]

All, 
 
I'm very new to js, please forgive if this is a n00b question. 
 
I have a script that takes user input from a textarea and dumps it into
a <pre> element in a new table cell. The problem is if you type in a
long sentance with no breaks, the <pre> will not allow it to wrap, and
it'll make the table super wide. I'm wondering if there's a javascript
function that will allow me to insert a \n every 80 characters? 
 
alternatively, I can dump the text in to just the table cell, but then
carriage returns aren't recognized at all, even though the text will
wrap. Is there a javascript version of str_replace()? 
 
Is there somewhere I can go to look up javascript functions?
 
Thanks in advance,
 
Matt
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