function correct_layout() {
   if(document.getElementById('content').offsetHeight) { 
      var div_heights = new Array( 
        document.getElementById('content').offsetHeight, 
        document.getElementById('navi_l').offsetHeight,
		document.getElementById('news').offsetHeight, 
        document.getElementById('ph_unten').offsetHeight 
      ); 
      div_heights = div_heights.reverse(div_heights.sort(num_sort)); 
      var style_height = div_heights[0]+15 + "px"; 
      document.getElementById('navi_l').style.height = style_height; 
      document.getElementById('content').style.height = style_height; 
      document.getElementById('ph_unten').style.height = style_height;
	  document.getElementById('news').style.height = style_height;
   } 
} 
function num_sort(a,b) { 
   return a-b; 
}