How to use StoreAlert in Selenium IDE

i tried following code,
[tr]
[td]type[/td]
[td]users[/td]
[td]1[/td]
[/tr]
[tr]
[td]store[/td]
[td]'alert'[/td]
[td]noofuseralert[/td]
[/tr]
[tr]
[td]click[/td]
[td]//input[@value='Submit'][/td]
[td][/td]
[/tr]
[tr]
[td]storeAlert[/td]
[td]${noofuseralert}[/td]
[td][/td]
[/tr]

nothing stored in that variable

i
don't understand how to store alert text in a variable, so many sites i
checked, but still i didn't get any idea about storeAlert syntax.


please reply any one.

regards
aanand