Application ICON on portal

Hi All,

In custom dialog transactionin ABAP ,i create some ICON in application tool bar, and i made transaction iview for this transaction to see it from PORTAL.But when i display this iview on portal, i am not seeing ICON (Which i see in SAP ABAP) only icon-text is comming as a button in application toolbar,no icon is showing there in portal iview,

Can you suggest the way out , how can i see the icon on portal as i see in sap abap.

Thanks,

Shyam.