Some frames shrinking when resizing browser window, how to fix?

[Designer43]

Hello,

I made a simple website with frames, here is a link to it to view :

http://user43.hostei.com/Index.html

And to Download website files:

http://user43.hostei.com/Site.zip





As you see the frames it has are :

Top.html - The top frame which I probably will put some large title text on

left.html - just for general info, this is the one with the sample text

UntitledFrame-2 - this frame is for the purpose of having the image on it of the smooth curve

logo.html - frame for the logo picture

mainframe.html - for the main content.

The problem I am having, is when I open it in a browser, on full screen it looks ok, but now have a go and try resizing it, you will see the frame Untitledframe-2 begins to shrink and the curve on it begins to dissapear, the logo frame also begins dissapearing and is overlapped by the left.html frame

Is there any way I can make those frames (logo.html and Untitledframe-1) not get overlapped/dissapear when the window begins to be re-sized in the browser?

I've made websites before using dreamweavers default framesets and the frames don't get squashed/dissapear so I'm thinking there must be something I'm doing wrong when I'm manually creating extra frames.

I know frames isn't the conventional way to make websites in Todays standards but I use them because it mostly works ok for simple websites.

Any suggestions welcome.

Thanks.