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change image button image

Posted By:      Posted Date: August 23, 2010    Points: 0   Category :ASP.Net

i am making a web form with a VB code behind.  on the form I have a down arrow imageButton that when pressed hides certain data.  what i want to do is change the button to an up arrow and vice versa whenever pressed.  i have both images loaded onto my project already.  any suggestions.

thank you

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