function align_layers(){
	//sub_menu_container
	//var doc_height = document.getElementById('container').offsetHeight;
	//var doc_width  = document.getElementById('container').offsetWidth;
	//twee kunnne de langste zijn, het menu of de content 
	var menu_height = document.getElementById('sub_menu').offsetHeight;
	var content_height = document.getElementById('content').offsetHeight;
	
	
	var min_height = 500;
	var min_width  = 977;	
	
	
	//document.getElementById('submenu_container').style.height = (doc_height-150) + 'px';
	//document.getElementById('content').style.height = (doc_height-150) + 'px';

	//minimale width instellen
	if(document.getElementById('main_menu_container').offsetWidth < min_width){
		document.getElementById('main_menu_container').style.width = min_width + 'px';
	}
	if(document.getElementById('content').offsetWidth < min_width){
		document.getElementById('content').style.width = (min_width-181) + 'px';
	}
	
	//minimale hoogte instellen
	if(document.getElementById('sub_menu_container').offsetHeight < min_height){
		document.getElementById('sub_menu_container').style.height = (min_height-30) + 'px';
	}
	if(document.getElementById('content').offsetHeight < min_height){
		document.getElementById('content').style.height = (min_height-51) + 'px';
	}
	
	
	if( (content_height > menu_height) &&  (content_height > min_height)){
		min_height = content_height+150;
		document.getElementById('sub_menu_container').style.height = (min_height) + 'px';
		
	}
	
	if( (menu_height > content_height) &&  (menu_height > min_height)){
		min_height = menu_height+150;
		document.getElementById('sub_menu_container').style.height = (min_height) + 'px';
		document.getElementById('content').style.height = (min_height) + 'px';
		
	}
}

	function popup_nieuws(id){
		var popup_width  = 750;
		var popup_height = 449;
		//eerst de scherm afmetingen opvragen getest in ie 6.0, firefox 1.04,Mozilla 1.7.8
		var popup_top  = ((screen.height - popup_height) / 2);
		var popup_left = ((screen.width  - popup_width ) / 2);
		
		window.open("./contentbuilding/popup_news.php?Id=" + id,"replace","directories=no,height=" + popup_height + ",width=" + popup_width + ",left=" + popup_left + ",top=" + popup_top + ",scrollbars=true");
	}