function checkFields() {
missinginfo = "";
if (document.form.Name.value == "") {
missinginfo += "\n     -  Name";
}
if (document.form.company.value == "") {
missinginfo += "\n     -  Company";
}
if (document.form.tel.value == "") {
missinginfo += "\n     -  Telephone";
}
if ((document.form.Email.value == "") || 
(document.form.Email.value.indexOf('@') == -1) || 
(document.form.Email.value.indexOf('.') == -1)) {
missinginfo += "\n     -  Email address may need @ or .";
}
if (missinginfo != "") {
missinginfo ="_____________________________\n" +
"You failed to correctly fill in your:\n" +
missinginfo + "\n_____________________________" +
"\nPlease amend your details!";
alert(missinginfo);
return false;
}
else return true;
}