window.onresize = resizediv;

function resizediv()
{
var uu = window.getHeight();	 
$("right").style.height = (uu - $("right").offsetTop  - 40)+ "px";
$("content").style.height = (uu - $("content").offsetTop  - 40)+ "px";

if ($("post").getStyle("height") < $("content").getStyle("height")) 
{
$$('.backupl').setStyle("display", "none");
$$('.backdownl').setStyle("display", "none");
$$('.backupll').setStyle("display", "none");
$$('.backdownll').setStyle("display", "none");
}

else
{
$$('.backupl').setStyle("display", "block");
$$('.backdownl').setStyle("display", "block");
$$('.backupll').setStyle("display", "block");
$$('.backdownll').setStyle("display", "block");
}
}