function checkForm(f)
{

if(f.user.value == "")
{
alert("The field Name is not filled");
document.forms[0].user.focus()
return false;
}

if(f.adress.value == "")
{
alert("The field Address is not filled");
document.forms[0].adress.focus()
return false;
}

if(f.tel1.value == "")
{
alert("The field Telephone is not filled");
document.forms[0].tel1.focus()
return false;
}

if(f.comments.value == "")
{
alert("The field Message is not filled");
document.forms[0].comments.focus()
return false;
}

return true;
}