how to split the line into two parts line not exceed 120

Question

  Avoid artifacts with longer than x characters

 

 

$("#Attachmessage", parent.document).html("Document uploaded successfully. Please click on submit to save the document.");

 

 

The above line is exceed to 120 characters.

 

i want to split into two parts. when spliting i want character not exceed 120 characters.

 

for that how can i do.