//Validation for the popup screen

function isValid(theForm)
{
	var retVal = true;
	var strMsg = '';
	
	if(theForm.realname.value.length == 0) 
	{
		strMsg = strMsg + 'You have not entered a name \n';
		retVal = false;
	}
	if(!check_postcode(theForm.txtPostcode.value)) 
	{
		strMsg = strMsg + 'You have not entered a valid Postcode\n';
		retVal = false;
	}
	if(theForm.txtTelephone.value.length = 0) 
	{
		strMsg = strMsg + 'You have not entered a telephone number\n';
		retVal = false;
	}
	if(!check_email(theForm.email.value)) 
	{
		strMsg = strMsg + 'You have not entered a valid eMail\n';
		retVal = false;
	}
	if(theForm.txtMessage.value.length = 0)
	{
		strMsg = strMsg + 'You have not entered a message\n';
		retVal = false;
	}	
	if(!retVal)
	{
		   alert(strMsg);
	}    
	return retVal;
}