input: [Key-value] mtfTop=value [Description] 
output: Lets you specify the distance of a Floating or Overlay ad, in pixels or as a percentage, from the top edge of a web page in a browser window. Uses values from -1500 to 1500 as px, pct, or pxc. Notes You can only override this value for Floating or Overlay creatives. For ads with Floating creatives, you can append px or pct after the integer to specify whether the positioning is determined by pixels or as a percentage. For example, if you use the key-value mtfTop=40pct, the Floating ad is displayed a distance of 40 percent below the top edge of the web page in the user's browser window. If you do not specify px or pct after the integer, pixels are the unit of measure by default.