function calculate(){
	var number = document.myform.num.value;
	if(number==""){
		alert("Please enter in your barcode number");
		return false;
	}
}
function checkContact(){
	
	var name = document.myform2.nam.value;
	var email = document.myform2.emailAdd.value;
	
	
	if(name==""){
		alert("Please enter your name");
		document.myform2.nam.focus();
		return false;
	}
	
	var atPos=email.indexOf("@");
	var stopPos=email.lastIndexOf(".");
	var len=email.length-1;	
	var checkLast = len-stopPos;
	
	if(email==""){
		alert("please enter your email address");
		document.myform2.emailAdd.focus();
		return false;
	}
	if(atPos==-1 || stopPos==-1){
		alert("This email address is not valid");
		document.myform2.emailAdd.focus();
		return false;
	}
	if(atPos < 1){
		alert("This email address is not valid");
		document.myform2.emailAdd.focus();
		return false;
	}
	if(checkLast<2||checkLast>4){
		alert("This email address is not valid");
		document.myform2.emailAdd.focus();
		return false;
	}
	if(stopPos<atPos){
		alert("This email address is not valid");
		document.myform2.emailAdd.focus();
		return false;
	}	
	
}
function checkContact2(){
	
	var name = document.myform.nam.value;
	var email = document.myform.emailAdd.value;
	var enq = document.myform.enquiry.value;
	
	if(enq==""){
		alert("Please enter your enquiry");
		document.myform.enquiry.focus();
		return false;
	}
	
	if(name==""){
		alert("Please enter your name");
		document.myform.nam.focus();
		return false;
	}
	
	var atPos=email.indexOf("@");
	var stopPos=email.lastIndexOf(".");
	var len=email.length-1;	
	var checkLast = len-stopPos;
	
	if(email==""){
		alert("please enter your email address");
		document.myform.emailAdd.focus();
		return false;
	}
	if(atPos==-1 || stopPos==-1){
		alert("This email address is not valid");
		document.myform.emailAdd.focus();
		return false;
	}
	if(atPos < 1){
		alert("This email address is not valid");
		document.myform.emailAdd.focus();
		return false;
	}
	if(checkLast<2||checkLast>4){
		alert("This email address is not valid");
		document.myform.emailAdd.focus();
		return false;
	}
	if(stopPos<atPos){
		alert("This email address is not valid");
		document.myform.emailAdd.focus();
		return false;
	}
	
	
	
}