css - why is the white image unevenly distributed?

on this site: http://yoursdproperty.com/index.php?option=com_jumi&fileid=8&Itemid=34

as you can see the white background a little bit of the grey开发者_JAVA百科 at the bottom is not solid, it stops and then starts over. do you know how smooth it out? alt text http://img29.imageshack.us/img29/2944/fullscreencapture131201.png

setting your iframe style like bellow might work as a quick fix, but i think there is a bit of a Code Smell in the page structure.

width: 850px; height: 650px; background-color: white;

EDIT: for the other bits try

<div id="wrapper_2">
  <div id="holder">
    <div id="content" style="background-color: white;">

As for the footer, i think you just need to rethink how you're using the background image.