Formatting textField populated from XML

I am populating the text of text fields with data from an XML file. I would like to do two things.
The code looks like this:

DSGbox.textFirstName.htmlText =;
    DSGbox.textLastName.htmlText =;

[]First, I would like to format the text… bold, font size, etc…
]Second, I would like to concatenate the first and last name to appear on the same line without space in between caused by two text fields. I tried the following, but it didn’t work.

DSGbox.textFirstName.htmlText = +;