function checkadd1(){
        mu=this.document.contactform;
        var test_str = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/

        if ((mu.firstname.value=="")||(mu.lastname.value==""))
                {alert("You must enter your full name") }
        else
                if (mu.business.value=="")
                        {alert("We need to know what sort of organisation you are with") }
                else
                        if ((mu.address1.value=="")||(mu.town.value=="")||(mu.county.value=="")||(mu.postcode.value==""))
                                {alert("Please complete your address details") }
                        else
                                if ((mu.telephone.value=="")||(mu.email.value==""))
                                        {alert("We will need your contact details to get back to you") }
                                else
                                         if (!mu.email.value.match(test_str))
                                                 {alert("Invalid email address");
                                         }
                                         else {document.contactform.submit();}
}