Kathy, if you are not already using it, I strongly recommend giving the Firefox plugin Firebug a try. It is extremely helpful for figuring out why things don't fit together right.
I noticed that even in Firefox, there are a gap on the left of a few hundred pixels, both columns are being pushed to the right and this is what is causing your sidebar to drop.
I took a look at your CSS in Firebug, you have this rule for your wrapper:
Code:
#wrapper
background-position:center top;
background-repeat:repeat-x;
margin:0 auto;
width:970px;
}
I noticed that your header graphic is 1198px wide, but the wrapper is 970px wide, so that wrapper is pinching the content a bit.
When I disabled the "width:970px;" declaration, it fixed the problem and removed all that white space to the left.
This still leaves the content area much narrower than your header, you could edit this rule to widen the content div:
Code:
#content {
float:left;
margin:0;
padding:25px 0 0;
position:relative;
width:970px;
} Of course, then you might want to widen that first column to fill up the extra space and add a bit of margin to the left side.