function colsheight()
{
   var z1 = document.getElementById("left-top").offsetHeight;
   var z2 = document.getElementById("left-middle").offsetHeight;
   var z3 = document.getElementById("content-right").offsetHeight;


   var teaserheight = z3 - z1 - 32;
        /*    alert ( z3 );           */

   document.getElementById("left-middle").style.height   = teaserheight + 'px';

}