Hi again, the difference in your code, from my example is that you have your entire grid fluid. Both your "leftcontainer" and your "content" have a width in percentage and are floating. In this case you shouldn't use the margin-trick i supplied. My solution only applies if you want one fixed and one fluid column. To make both columns work with your solution, consider the following values:

#sidecontainer {
    margin-left:2%;
    float:left;
    width:12%;
}

#content {
    width:84%;
    height:100%;
    float: right;
}

The width of 84% is 100% - 12% (leftcol width) - 2% (leftcol margin) - 2% (margin between leftcol & rightcol).

You should also know that your statement "height:100%" has absolutely no effect on the divs.

Regarding fluid images and fluid background images there's a great article on it at "A list apart" at:

http://www.alistapar...s/fluid-images/