function show(id) {
    document.getElementById(id).style.visibility="visible";
}

function hide(id) {
    document.getElementById(id).style.visibility="hidden";
}

function displayNewUserFields() {
    hide('forgot_password');
    show('username_confirm_label');
    show('username_confirm');
    show('password_confirm');
    show('password_confirm_label');
}

function displayReturningUserFields() {
    show('forgot_password');
    hide('username_confirm_label');
    hide('username_confirm');
    hide('password_confirm');
    hide('password_confirm_label');
}

var ewd_domain = 'http://www.rainbowdivers.org/'; //set domain  
var ewd_loading_img = ewd_domain + 'images/loading.gif';//set image path  
var ewd_loading_msg = 'Loading Data';//set loading message  
var xmlhttp_obj = false;

//create the XMLHttpRequest
function ewd_xmlhttp(){  
 if (window.XMLHttpRequest){ // if Mozilla, Safari etc  
  xmlhttp_obj = new XMLHttpRequest();  
 }else if (window.ActiveXObject){ // if IE  
  try{  
   xmlhttp_obj = new ActiveXObject("Msxml2.XMLHTTP");  
  }catch (e){  
   try{  
    xmlhttp_obj = new ActiveXObject("Microsoft.XMLHTTP");  
   }catch (e){  
   }  
  }  
 }else{  
  xmlhttp_obj = false;  
 }  
 return xmlhttp_obj;  
}   //get content via GET  

function ewd_getcontent(url, containerid){  
 var xmlhttp_obj = ewd_xmlhttp();  
 document.getElementById(containerid).innerHTML = '<img src="' + ewd_loading_img + '" />' + ewd_loading_msg;  
 xmlhttp_obj.onreadystatechange=function(){  
         ewd_loadpage(xmlhttp_obj, containerid);  
         }  
 xmlhttp_obj.open('GET', url, true);  
 xmlhttp_obj.send(null);  
}       

function ewd_loadpage(xmlhttp_obj, containerid){  
 if ( xmlhttp_obj.readyState == 4 && xmlhttp_obj.status == 200 ){  
  document.getElementById(containerid).innerHTML = xmlhttp_obj.responseText;  
 }  
}