function collapse_areas(){
	var areas = collapse_areas.arguments;
	for(var i=0; i<areas.length; i++){
		//document.getElementsByName(areas[i]).style.display = "none";
		document.getElementById(areas[i]).style.display = "none";
	}
}

function set_visible_area(area){
	document.visible.area.value = area;
}

function switch_visible(new_visible){//switches header and area
	var new_area = new_visible + "_area";
	var old_area = document.visible.area.value + "_area";
	document.getElementById(old_area).style.display = "none";
	document.getElementById(new_area).style.display = "inline";	
	
	if(document.visible.area.value != 'default'){
		var old_header = document.visible.area.value + "_header";
		document.getElementById(old_header).className = "secondary_nav_text";
		document.getElementById(old_header).onmouseover = 'this.className="secondary_nav_hover";';
		document.getElementById(old_header).onmouseout = 'this.className="secondary_nav_text";';
	}
	var new_header = new_visible + "_header";
	document.getElementById(new_header).className = "secondary_nav_on";
	document.getElementById(new_header).onmouseover = '';
	document.getElementById(new_header).onmouseout = '';
	
	document.visible.area.value = new_visible;
	
}