function validateemailus(form){

    if (form.name.value==""){
        alert("Please enter your name");
        form.name.focus();
        return false;
    }
    else if (form.email.value==""){
        alert("Please enter your email address");
        form.email.focus();
        return false;
    }
    else if (form.email.value.indexOf('@')==-1 || form.email.value.indexOf('.')==-1){
        alert("Your email address appears broken, please enter a valid email address.");
        form.email.focus();
        return false;
    }
    
    else if (form.phonenumber.value==""){
        alert("Please enter your Contact Number");
        form.phonenumber.focus();
        return false;
    }
    else if (form.query.value==""){
        alert("You seem to have forgotten to enter an enquiry or comment.");
        form.query.focus();
        return false;
    }
    
    return true;
}