add onclick event after WebForm_DoPostBackWithOptions?

When I add an onclick event to a button it renders it before the WebForm_DoPostBackWithOptions function. ( I have validation controls running)

 <INPUT id=ctl00_ContentPlaceHolder1_btnSave onclick='javascript: resetFlag;WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions("ctl00$ContentPlaceHolder1$btnSave", "", true, "", "", false, false)); resetFlag();' type=submit value=Save name=ctl00$ContentPlaceHolder1$btnSave>


I want to add resetFlag after the WebForm_DoPostBackWithOptions like this.

 <INPUT id=ctl00_ContentPlaceHolder1_btnSave onclick='javascript: WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions("ctl00$ContentPlaceHolder1$btnSave", "", true, "", "", false, false)); resetFlag();' type=submit value=Save name=ctl00$ContentPlaceHolder1$btnSave>

Is the possible?
   
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