function checkForm()
  {

	if (document.getElementById("name").value == "")
    {	

      window.alert("Please enter your name");
	  document.getElementById("name").focus();
	  return false;
    }
	 
    
    else if (document.getElementById("address").value == "")
    {

      window.alert("Please enter your address");
	  document.getElementById("address").focus();
	  return false;

    }

    else if (document.getElementById("phone").value == "")
    {

      window.alert("Please enter your telephone number");
	  document.getElementById("phone").focus();
	  return false;
	  }

	  if(document.getElementById("phone").value.search(/\d{4}\-\d{4}/)==-1)

	  {
     alert("The phone number you entered is not valid.\r\n Please enter a phone number with the format xxxx-xxxx.");
	  document.getElementById("phone").focus();
      return false;
   }

	 var min=9;//a variable of a minimum of 9 numbers
	  
	 if(document.getElementById("phone").value.length != min)/
	 {

    alert("The phone number you entered is not valid.\r\n Please enter a phone number with a maximum length of xxxx-xxxx.");
	 document.getElementById("phone").focus();
      return false;
   }

    else if (document.getElementById("suburb").value == "")
    {

      window.alert("Please enter your suburb area");
	  document.getElementById("suburb").focus();
	  return false;
    }
	else if (document.getElementById("postcode").value == "")
	{

	window.alert("Please enter your postcode");
	document.getElementById("postcode").focus();
	return false;
	}

	var postcode = new String("1234");
	 
	if (document.getElementById("postcode").value.length !=4)
	{

	alert("Your postcode must contain four numbers only!");
	document.getElementById("postcode").focus();
	return false;
	}

	var postcode = new String("1234");
	
	if (isNaN(document.getElementById("postcode").value))
	{
	alert ("Please enter only numbers!");
	document.getElementById("postcode").focus();
	return false;
	}
  
	else if (document.getElementById("email").value == "")
    {

	 window.alert("Please enter your email address!");
	 document.getElementById("email").focus();
	 return false;
	}

   var email = document.getElementById("email");
   //variables to remember the position of the "@" and "." symbols
   var atPos = email.value.indexOf("@");
   var dotPos = email.value.indexOf(".");
  
 if (atPos == -1 || atPos == 0 ||dotPos == -1 || atPos <1 || dotPos - atPos <2 || email.value.length <3)
   { 
	window.alert("Please enter a valid email address!");
	document.getElementById("email").focus();
    return false;
    
 	}

 	else if(document.getElementById("card").selectedIndex == 0)
	{

	alert("Please select your credit card");
	document.getElementById("card").focus();
	return false;
	}

	else if(document.getElementById("month").selectedIndex == 0)
	{

	alert("Please select the month of expiry");
	document.getElementById("month").focus();
	return false;
	}

	else if(document.getElementById("year").selectedIndex == 0)
	{

	alert("Please select the year of expiry");
	document.getElementById("year").focus();
	return false;
	}
		return true;
   }