function calculate() {
	$('gold').request({onComplete: function(reply) { $('price').update(reply.responseText); }});
}

function validate()
{
   if(document.details.fname.value=='')
   {
     alert("Please enter your first name");
	 document.details.fname.focus();
	 return false;
   }
   if(document.details.add1.value=='')
	   {
		 alert("Please enter your address");
		  document.details.add1.focus();
		 return false;
	   }
     if(document.details.city.value=='')
	   {
		 alert("Please enter your town/city");
		  document.details.city.focus();
		 return false;
	   }
     if(document.details.county.value=='')
	   {
		 alert("Please enter your county");
		  document.details.county.focus();
		 return false;
	   }	   
	 if(document.details.pcode.value=='')
	   {
		 alert("Please enter your post code");
		  document.details.pcode.focus();
		 return false;
	   }
	 if(document.details.tel.value=='')
	   {
		 alert("Please enter your telephone number");
		  document.details.tel.focus();
		 return false;
	   }
	 if(document.details.email.value=='')
	   {
		 alert("Please enter your email address");
		  document.details.email.focus();
		 return false;
	   }
	 if(document.details.hear.value=='')
	   {
		 alert("Please enter how you heard about us");
		  document.details.hear.focus();
		 return false;
	   }
	}