How to highlight words or phrases in pdf document?

is there any way to highlight the words in pdf document like that in microsoft word?How to highlight words or phrases in pdf document?
I am using PDF-Xchange Viewer now. It allows you add comments and annotations to any PDF file.





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http://www.anypdftools.com/blog/2009/06/鈥?/a>How to highlight words or phrases in pdf document?
open office free program with


text document


presetation


database


spreadsheet


drawing.....%26amp; more





http://download.openoffice.org/





text document can save as pdf.
Open Office should have the feature.