"label" and "tooltiptext" attributes for image-only toolbarbutton

STF <[email protected]>
Newsgroups gmane.comp.mozilla.devel.xpfe
Message-ID <[email protected]> 
	I'm quite confused on the "label" and "tooltiptext" attributes for 
toolbarbutton.

	You see, toolbarbutton has both "label" and "tooltiptext" attributes. 
When toolbarbutton is only an image, is there any subtle difference 
between  "label" and "tooltiptext" attributes?  Do I have to define both 
in case the tool-tip text is dynamically changed?

	Thanks
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