Popup.show autoHide Problem

Hai… I am using the popup :http://www.javascripttoolbox.com/libsource.php/popup/combined/popup.js

The command for showing popup: Popup.show(‘contentDiv’, ‘targetDiv’,“above left”,{‘constrainToScreen’:true, ‘autoHide’:false});

Without 'autoHide’ property i can use the command: Popup.hideAll(); for closing popup, But when i am using this 'autoHide’ property, how can i close the popup?? Popup.hideAll(); is not working with me…
please help me…