function PostForm(nextvar) {
   document.wizardform.action.value="Next";
   if (nextvar) document.wizardform.nextscreen.value=nextvar;
  document.wizardform.submit();
 }
  function PostFormPrev() {
   document.wizardform.action.value="Previous";
  document.wizardform.submit();
 }

  <!-- Begin
  function checkrequired(which) {
      var pass=true;

      if (document.images) {


	  if(!CheckEmail()){
		alert("Email is not valid");
		return false;
	  }


          for (i=0;i<which.length;i++) {
              var tempobj=which.elements[i];

              if (tempobj.name=="Forename" || tempobj.name=="Surname" || tempobj.name=="Company" || tempobj.name=="Phone" || tempobj.name=="Email" || tempobj.name=="comments") {
                  if (tempobj.value=='') {
                      pass=false;
                      break;
                  }
              }
          }
      }
      if (!pass) {

	  var pep = tempobj.name.replace(/_/g, " ");
          alert("Please make sure the required field "+pep+" is filled in.");
          return false;
      }
      else
          return true;
  }

 function CheckEmail() {
	email = document.getElementById('email').value

	AtPos = email.indexOf("@")
	StopPos = email.lastIndexOf(".")
	Message = ""

	if (email == "") {
		return false
	}

	if (AtPos == -1 || StopPos == -1) {
		return false 
	}

	if (StopPos < AtPos) {
		return false
	}

	if (StopPos - AtPos == 1) {
		return false
	}

 return true
}


//  End -->