formatting HTML form layout
===

I have a HTML form which I need to format. It is a long form and people have to scroll(Vertically) to access the entire from. Now, I have a lot of white space on the right side of the form fields, I want to divide the form into three sections and display Three sections Horizontally as compared to one long vertical form. 

Current Layout:

    Field1
    Field2
    Field3
    Field4
    Field5
    Field6

New Layout:

    Field1     Field3     Field5
    Field2     Field4     Field6



What is the best way of approaching this?

Thanks in advance