function validateForm(zerpa)
{

if(""==document.forms.zerpa.x_First_Name.value)
{
alert("Please enter your First name.");
document.forms.zerpa.x_First_Name.focus();
return false;
}

if(""==document.forms.zerpa.x_Last_Name.value)
{
alert("Please enter your Last name.");
document.forms.zerpa.x_Last_Name.focus();
return false;
}

if(""==document.forms.zerpa.x_Address.value)
{
alert("Please enter your billing address.");
document.forms.zerpa.x_Address.focus();
return false;
}
if(""==document.forms.zerpa.x_City.value)
{
alert("Please enter the billing city name.");
document.forms.zerpa.x_City.focus();
return false;
}
if(""==document.forms.zerpa.x_Zip.value)
{
alert("Please enter your billing zip code.");
document.forms.zerpa.x_Zip.focus();
return false;
}
if(""==document.forms.zerpa.Contact_WorkPhone.value)
{
alert("Please enter your phone number, this number is the one that we need if we have any questions.");
document.forms.zerpa.Contact_WorkPhone.focus();
return false;
}
if(""==document.forms.zerpa.x_phone.value)
{
alert("Please enter your phone number at the event, this number is important in case that our staff needs directions to get your event.");
document.forms.zerpa.x_phone.focus();
return false;
}
if(""==document.forms.zerpa.x_Email.value)
{
alert("Please enter your e-mail address, this is required since we are going to send you all the bill and confirmation here.");
document.forms.zerpa.x_Email.focus();
return false;
}
if(""==document.forms.zerpa.number_of_guest.value)
{
alert("Please enter your number of guest!  Remember you must call 2-3 days before your event to give us the final count, failure to do may result in increased of your bill.");
document.forms.zerpa.number_of_guest.focus();
return false;
}
if(""==document.forms.zerpa.event_date.value)
{
alert("Please enter the date of your event");
document.forms.zerpa.event_date.focus();
return false;
}
if (!validateCreditCard(document.forms.zerpa.ccfield.value)) 
{
alert('credit card number is invalid or was not entered correctly');
document.forms.zerpa.ccfield.focus();
return false; 
}
if (zerpa.cardYear.selectedIndex == 0)
{
alert("Please Select Your Credit Card Expiration Year");
document.forms.zerpa.cardYear.focus();
return (false);
}
if (zerpa.cardMonth.selectedIndex == 0)
{
alert("Please Select Your Credit Card Expiration Month");
document.forms.zerpa.cardMonth.focus();
return (false);
}
}