PostBackUrl Changes on All Buttons

I have a very strange problem here.  There is a page with an ImageButton displayed inside a user control (ascx file).  This ImageButton only needs to perform JavaScript, so I disabled the postback by setting postbackurl to "javascript:void(0);".  After I click on this ImageButton, though, the postbackUrl on all the other Asp buttons also become "javascript:void(0);".  I can see it when I hover over them in IE.   So, my Asp:buttons are essentially then disabled.

Is this normal?  I don't change the postBackUrl on an object very often.  But is it supposed to make it change on all the other buttons?  Before I click on the first button, the other Asp buttons work fine and execute their postback instructions.  Only after clicking on the first button does the postBackUrl change.  I know it's not the fault of the javaScipt instructions I'm calling because it happens even after it is commented out.

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dparkesAsked:
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sdrouinsCommented:
all you have to do is set the OnClientClick proprty dont change de postpackurl property...

OnClientClick="youJsFunction();return false;"

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dparkesAuthor Commented:
I tried that and it did not work.  Seems like all the rules change now that the button is in a user control.  
I think I've fixed it by explicitly setting the postbackurl parameter in the buttons.    
dparkesAuthor Commented:
Ah yes, this was right.  I had other conflicting code that was masking this issue.
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