function validate_signup(frm) 
{
   var emailAddress = frm.Email.value;
   var errorString = '';
   if (emailAddress == '' || emailAddress.indexOf('@') == -1) 
   {
      errorString = 'Please enter your email address';
   }
   
   var els = frm.getElementsByTagName('input');
   for (var i = 0; i < els.length; i++)
   {
      if (els[i].className == 'text' || els[i].className == 'date' || els[i].className == 'number') 
      {
         if (els[i].value == '')
         {
            errorString = 'Please complete all required fields.';
         }
      }
      else if (els[i].className == 'radio')
      {
         var toCheck = document.getElementsByName(els[i].name);
         var radioChecked = false;
         for (var j = 0; j < toCheck.length; j++)
         {
            if (toCheck[j].name == els[i].name && toCheck[j].checked)
            radioChecked = true;
         }
         if (!radioChecked)
         {
            errorString = 'Please complete all required fields.';
         }
      }
   }
   
   var isError = false;
   if (errorString.length > 0)
   isError = true;
   
   if (isError)
   alert(errorString);
   return !isError;
}