Break continues text(WRAP TEXT)

When there is continues text like "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" it disturbs the text format.There are 2 ways to do it
1)Adding newline or break after every 100 characters using Javascript.
2)Wrap text by adding style into div tag

Example of first way
-----------------------------------
<div id="company_expertise">
<%long_string = "MYCompanyExpertiseMYCompanyExpertiseMYCompanyExpertiseMYCompanyExpertise"%>
<%= hidden_field_tag "hnd_company_expertise", long_string %>
</div>
<script type="text/javascript">

str1 = document.getElementById("hnd_company_expertise").value;
str = str1.replace(/(.{100})/g, "$1\n");
document.getElementById("company_expertise").innerHTML = str;
</script>
Example of second way
-----------------------------------------
<div style="word-wrap: break-word;">
<%= "MYCompanyExpertiseMYCompanyExpertiseMYCompanyExpertise" %>
</div>