Implementing Title Case using Java Script

Today I recieved a query to implement title case for the name fields in CRM.
This can simply be achieved by writing a custom Java Script method as below:
Add this code on the OnChange event of First Name attribute in Contact:

// JScript source code - TitleCase
var strTitleCase
var str = crmForm.all.firstname.DataValue
str.Substring(toUpperCase();
if(str != null)
{
strTitleCase = toTitleCase(str);
crmForm.all.firstname.DataValue = strTitleCase;
}
function toTitleCase(str)
{
return str.replace(/\w\S*/g, function(txt){return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();});
}