<iframe src="http://crea8tion.com/PP/usercapture/index.php" scrolling="no" height="280px"></iframe>

width = non-negative integer
Give the width of the visual content of the element, in CSS pixels.

height = non-negative integer
Give the height of the visual content of the element, in CSS pixels.

<iframe width="100%" height="588" style="border:none; background:transparent; overflow:hidden;" />

<iframe height="588" style="border:none; background:transparent; overflow:hidden; width:100%;" />