// JavaScript Document
/* <![CDATA[ */
function getCookie(name) {
  var dc = document.cookie;
  var prefix = name + "=";
  var begin = dc.indexOf("; " + prefix);
  if (begin == -1) {
    begin = dc.indexOf(prefix);
    if (begin != 0) return null;
  } else
    begin += 2;
  var end = document.cookie.indexOf(";", begin);
  if (end == -1)
    end = dc.length;
  return unescape(dc.substring(begin + prefix.length, end));
}

// list all show/hide element IDs here
menus_array = new Array ('joinus','topics','publications','software','datasets','media','people','teaching','database', 'links', 'contactus');
menus_status_array = new Array ();// remember switches
img_close = 'rollup';
img_open = 'rolldown';

function toggleSheet(theid) {
  if (document.getElementById) {
    for (var i=0; i < menus_array.length; i++) {
    			var id = menus_array[i];
    			var switch_id = document.getElementById(id);
    			var imgid = id+'Button';
    			//var button_id = document.getElementById(imgid);
    			if (id!=theid || (menus_status_array[theid]=='show')) {    				
      			//button_id.className = 'rollup';
      			switch_id.className = 'hideSwitch';
	  				menus_status_array[id] = 'hide';
	  				document.cookie = id+'=hide';	
				}
				else {					
					//button_id.className = 'rolldown';
      			switch_id.className = 'showSwitch';
	  				menus_status_array[id] = 'show';
	  				document.cookie = id+'=show';
    			}     	
    } 
  }   
}     
      
function setMenu() { // read cookies and set menus to last visited state
  if (document.getElementById) {
    	for (var i=0; i < menus_array.length; i++) {
    			var idname = menus_array[i];
      		if (document.getElementById(idname)) {
						var switch_id = document.getElementById(idname);
						var imgid = idname+'Button';
						//var button_id = document.getElementById(imgid);
						//alert(imgid);
						if (getCookie(idname) == 'show') {
					  		//button_id.className = 'rolldown';
					  		switch_id.className = 'showSwitch';
					  		menus_status_array [idname] = 'show';
						}
						else {
					  		//button_id.className = 'rollup';
					  		switch_id.className = 'hideSwitch';
					  		menus_status_array [idname] = 'hide';
						}
	  			}
	  	// else { alert("Switch '"+idname+"' is not present on this page."); }
    }
  }
}