fix wait cursor's z-order css for compatibility with Firefox and IE.
fix wait cursor's z-order css for compatibility with Firefox and IE.

Zosoled/Cumulus,Zosoled/Cumulus,Zosoled/Cumulus,cdcarter/Cumulus,SalesforceFoundation/Cumulus,cdcarter/Cumulus,SalesforceFoundation/Cumulus,Zosoled/Cumulus,SalesforceFoundation/Cumulus,cdcarter/Cumulus,SalesforceFoundation/Cumulus,cdcarter/Cumulus