images overlaying other content

This one has me stumped, and perhaps someone can tell me what I've missed 
...

ON this page at http://203.108.76.35/articles/a100241p1.htm  when you change 
the size of the screen using IE4, the thumbnail picture of the girl with the 
birthday cake slides over the top of the table, rather than causing it to 
move aside.

Also, lower down in the page, the table with the header "Natural, artificial 
or nature-identical?" slides over the top of text instead of pushing it 
aside.

I didn't know this was possible ... I thought perhaps we must have used 
layers here, but apparently not.  can anyone tell me what we've done here?

Cheers,
Mike Kear
Webmaster,  Australian Consumers Association

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