// JavaScript Document
function validateRegistration(){
   with (document.main){
      var problem = 0
      var message = ""
      if (name.value==""){
         problem++
         message+="\nPlease enter your name."
      }            
      if (!verifyEmail(email.value)){
         problem++
         message+="\nPlease enter your valid email address."
      }
	  if (!jQuery("input[name='member']").is(':checked')) {
       	 problem++
         message+="\nPlease select member/guest."
      }
      if (payment_method.value==""){
         problem++
         message+="\nPlease enter your payment method."
      }            
      if (problem > 0){
         alert(message);
         return false;
      }
      else{
         return true;
      }
   }
}

function verifyEmail(addr) {
    var atPos = addr.indexOf('@');
    var dotPos = addr.lastIndexOf('.')
    if (atPos>0 && dotPos>atPos+1) return true;
    else
       return false;
}

function left(str, n){
   if (n <= 0)
       return "";
   else if (n > String(str).length)
       return str;
   else
       return String(str).substring(0,n);
}

function right(str, n){
    if (n <= 0)
       return "";
    else if (n > String(str).length)
       return str;
    else {
       var iLen = String(str).length;
       return String(str).substring(iLen, iLen - n);
    }
}