How to avoid page content wrapping?

How to avoid page content wrapping when resize the window?

i mean when user resize his browser window or page content is
larger then available browser windows size, then the page content
should not be wrap, instead of scroll should appear,
so how can i do that?

To avoid page content wrapping, i have used white-space: nowrap; in my body tag, then scroll does appear but body tag does not increase
its width. content goes out of body tag and scroll part shows with white
background(body and form width set as 100%), can any one help me?

i have used menu in my form so when i resize browser then it's only wrap,
i want the scroll when browser size decrease.please help me.