function colsheight()
{
   var leftheight;
   var centerheight;
   var rightheight;

   leftheight   = document.getElementById("content-left").offsetHeight;
   centerheight = document.getElementById("content-center").offsetHeight;
   rightheight  = document.getElementById("content-right").offsetHeight;


   var allheights  = new Array(leftheight, centerheight, rightheight);

   function Numsort(a,b)
   {
     return b-a;
   }
   allheights.sort(Numsort);


   document.getElementById("content-left").style.height   = allheights[0] + 'px';
   document.getElementById("content-center").style.height = allheights[0] + 'px';
   document.getElementById("content-right").style.height  = allheights[0] + 'px';


}