// JavaScript Document
function toggle_menu(id){
	
	//check to see if it is showing
	var sub_menu = "sub_"+id;
	var img_on = "images/buttons/"+id+"_off.gif";
	var img_off = "images/buttons/"+id+"_off.gif";
	
	if( document.getElementById(sub_menu).className == 'sub_menu_hide' ){
		reset();
		reset_images()
		document.getElementById(sub_menu).className = 'sub_menu_show';
		document[id].src = img_on;
		
	} else {
		reset();
		reset_images()
		document.getElementById(sub_menu).className = 'sub_menu_hide';
		document[id].src = img_off;
	}
}

function toggle_menu_main(id){
	
	//check to see if it is showing
	var sub_menu = "sub_"+id;
	
	if( document.getElementById(sub_menu).className == 'sub_menu_hide' ){
		reset()
		document.getElementById(sub_menu).className = 'sub_menu_show';
		
	} else {
		reset()
		document.getElementById(sub_menu).className = 'sub_menu_hide';
	}
}

function reset(){
	 document.getElementById('sub_people').className  = 'sub_menu_hide'; 
	 document.getElementById('sub_programs').className  = 'sub_menu_hide'; 
	 document.getElementById('sub_seminars').className  = 'sub_menu_hide'; 
	 document.getElementById('sub_research').className  = 'sub_menu_hide'; 
	 document.getElementById('sub_resources').className  = 'sub_menu_hide';
	 
  }
  
function reset_images(){
	   document['people'].src = "images/buttons/people_off.gif";
	 document['programs'].src = "images/buttons/programs_off.gif";
	 document['research'].src = "images/buttons/research_off.gif";
	 document['seminars'].src = "images/buttons/seminars_off.gif";
	 document['resources'].src = "images/buttons/resources_off.gif";
	 document['links'].src = "images/buttons/links_off.gif";
  }