function validate_form ( )
{
document.signbox.dataX.value = signatureX;
document.signbox.dataY.value = signatureY;

valid = true;

if ( document.signbox.name.value == "" )
{
alert ( "Please fill in the 'Name' box." );
valid = false;
}
if (  signatureX.length < 30 )
{
alert ( "Please sign in the Signature box." );
 valid = false;
}
return valid;
}