in the spry options script, you could add an errorClass, for example:
var form1_Opts = {
focusout: true,
focusin: false,
change: false,
keyup: false,
popupClass: "Bloom",
pointedAt: "left",
fieldOffset: 10,
fieldMargin: 2,
position: "left",
direction: "left",
border: 1,
offset: 25,
closeText: "?",
percentWidth: 100,
orientation: "bottom",
errorClass: "fieldError",
};
then add CSS to set the errorClass appearance:
<style type="text/css">
.fieldError { background-color:red; }
</style>