DIV Layout

I am trying to do this

But when i put content in DIV 1 it pushes DIV's 2 & 3 down.

how do i stop that

I did it buy putting 2 inside 1 and then 3 inside 2, otherwise they ended up under eachother, whats the best way to do this.

#510284

<div style="width:100%;float:left;overflow:hidden;">
 <div style="float:left;width:75%;">left</div>
 <div style="float:right;width:25%;">
  <div>top right</div>
  <div>bottom right</div>
 </div>
</div>

#510292

thanks again david

#510293