/*-------------------------------------------------------------------
* TabNext()
* Function to auto-tab Permit Number fields
* Arguments:
*   obj :  The input object (this)
*   event: Either 'up' or 'down' depending on the keypress event
*   len  : Max length of field - tab when input reaches this length
*   next_field: input object to get focus after this one
* -------------------------------------------------------------------
*/
var permit_field_length=0;
function TabNext(obj,event,len,next_field) {

	if (event == "down") {
		permit_field_length=obj.value.length;
	}
	else if (event == "up") {
		if (obj.value.length != permit_field_length) {
			permit_field_length=obj.value.length;
			if (permit_field_length == len) {
				next_field.focus();
			}
		}
	}
}