function checkForm() {
var firstnameValue = document.getElementById("firstname").value;
var lastnameValue = document.getElementById("lastname").value;
var streetValue = document.getElementById("street").value;
var zipValue = document.getElementById("zip").value;
var cityValue = document.getElementById("city").value;
var countryValue = document.getElementById("country").value;
var telephoneValue = document.getElementById("telephone").value;
var emailValue = document.getElementById("email").value;
var filter  = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9])+$/; 
var result = true;
<!-- Firstname __________________________________________-->
if (firstnameValue == "") {
    document.getElementById("firstname").style.border="1px solid #DE2922";
    document.getElementById("grey").style.color="#DE2922";
   result = false;
}
else {    
    document.getElementById("firstname").style.border="1px solid #A9A9A9";
} <!-- /Firstname -->
<!-- Lastname __________________________________________-->
if (lastnameValue == "") {
    document.getElementById("lastname").style.border="1px solid #DE2922";
    document.getElementById("grey").style.color="#DE2922";
   result = false;
}
else {    
    document.getElementById("lastname").style.border="1px solid #A9A9A9";
} <!-- /Lastname -->
<!-- Street __________________________________________-->
if (streetValue == "") {
    document.getElementById("street").style.border="1px solid #DE2922";
    document.getElementById("grey").style.color="#DE2922";
   result = false;
}
else {
    document.getElementById("street").style.border="1px solid #A9A9A9";
}<!-- /Street -->
<!-- Zip __________________________________________-->
if (zipValue == "") {
    document.getElementById("zip").style.border="1px solid #DE2922";
    document.getElementById("grey").style.color="#DE2922";
   result = false;
}
else {
    document.getElementById("zip").style.border="1px solid #A9A9A9";
}<!-- /Zip -->
<!-- City __________________________________________-->
if (cityValue == "") {
    document.getElementById("city").style.border="1px solid #DE2922";
    document.getElementById("grey").style.color="#DE2922";
   result = false;
}
else {
    document.getElementById("city").style.border="1px solid #A9A9A9";
}<!-- /City -->
<!-- Country __________________________________________-->
if (countryValue == "") {
    document.getElementById("country").style.background="#FFB2B2";
    document.getElementById("grey").style.color="#DE2922";
   result = false;
}
else {
    document.getElementById("country").style.background="";
}<!-- /Country -->
<!-- Telephone __________________________________________-->
if (telephoneValue == "") {
    document.getElementById("telephone").style.border="1px solid #DE2922"
    document.getElementById("grey").style.color="#DE2922";
   result = false;
}
else {
    document.getElementById("telephone").style.border="1px solid #A9A9A9";
}<!-- /Telephone -->
<!-- E-Mail __________________________________________-->
if ((emailValue == "") || (!filter.test(emailValue))){
    document.getElementById("email").style.border="1px solid #DE2922"
    document.getElementById("grey").style.color="#DE2922";
    document.getElementById("check") .className ='visible'
   result = false;
}
else {
    document.getElementById("email").style.border="1px solid #A9A9A9";
    document.getElementById("check") .className ='hidden';
}<!-- /E-Mail -->
if(result){
    document.getElementById("grey").style.color="";
}
return result
}

function doSubmit(){
    if(checkForm())
        document.forms[0].submit();
}