function content_height(){
    var assets = document.getElementById('assets');
    var sidebar = document.getElementById('sidebar');
    var content = document.getElementById('content');
    
    if( assets.offsetHeight < sidebar.offsetHeight ) {
	if( content.offsetHeight < sidebar.offsetHeight ) content.style.height = sidebar.offsetHeight+"px";
    } else {
	if( content.offsetHeight < assets.offsetHeight ) content.style.height = assets.offsetHeight+"px";
    }
}

Event.observe(window, 'load', content_height, false);