function checkForm() {

if (document.getElementById("first_name").value == "") {
hideAllErrors();
document.getElementById("fnameError").style.display = "inline";
document.getElementById("first_name").select();
document.getElementById("first_name").focus();
return false;
}
else
if (document.getElementById("email").value == "") {
hideAllErrors();
document.getElementById("emailError").style.display = "inline";
document.getElementById("email").select();
document.getElementById("email").focus();
return false;
}else
if (document.getElementById("Address").value == "") {
hideAllErrors();
document.getElementById("addressError").style.display = "inline";
document.getElementById("Address").select();
document.getElementById("Address").focus();
return false;
}
else
if (document.getElementById("City").value == "") {
hideAllErrors();
document.getElementById("cityError").style.display = "inline";
document.getElementById("City").select();
document.getElementById("City").focus();
return false;
}

return true;
}

function hideAllErrors() {
document.getElementById("fnameError").style.display = "none"
document.getElementById("emailError").style.display = "none"
document.getElementById("addressError").style.display = "none"
document.getElementById("cityError").style.display = "none"
}