// JavaScript Document

function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid email address")
		   return false
		}
		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid email address")
		   return false
		}
		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid email address")
		    return false
		}
		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid email address")
		    return false
		 }
		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid email address")
		    return false
		 }
		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid email address")
		    return false
		 }
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid email address")
		    return false
		 }
 		 return true					
	}

function validateBooking(){
	var f = document.membership;
	var emailID=document.membership.email;
	if (f.fname.value == ""){
		alert("Please fill in your first name");
		f.fname.focus();
		return false;
	}
	if (f.sname.value == ""){
		alert("Please fill in your last name");
		f.sname.focus();
		return false;
	}
	if (f.email.value == ""){
		alert("Please fill in your email address");
		f.email.focus();
		return false;
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	return true;
}