function checkform ( form )
{

  if (form.name.value == "") {
    alert( "Please enter your name." );
    form.name.focus();
    return false ;
  }

 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
	}

  var email=document.form.email

  if ((email.value==null)||(email.value=="")){
     alert("Please enter your email address.")
     form.email.focus();
     return false ;
  }

  if (echeck(email.value)==false){
     form.email.focus();
     return false ;
  }

  if (form.email2.value == "") {
    alert( "Please repeat your email address." );
    form.email2.focus();
    return false ;
  }

  if ((form.email2.value) != (form.email.value)){
     alert("Your email addresses do not match")
     return false ;
  }

  if (form.password.value == "") {
    alert( "Please enter your email password." );
    form.password.focus();
    return false ;
  }

  if (form.password2.value == "") {
    alert( "Please repeat your password." );
    form.password2.focus();
    return false ;
  }

  if ((form.password2.value) != (form.password.value)){
     alert("Your passwords do not match")
     return false ;
  }

  if (form.postcode.value == "") {
    alert( "Please enter the first part of your postcode (e.g. S6)\n\n(This is used to send you offers relating to your area.)" );
    form.postcode.focus();
    return false ;
  }

  if (!form.privacy.checked) {
    alert ( "You must read and agree to our privacy policy in order to join.");
    form.privacy.focus();
    return false;
  }

  return true ;
}