How avoid the page refresh while checking the confirm pswd??

Question

Am trying to check the confirm password but while checking the confirm password the page is refreshing after it showing empty text box even though the confirm password is matching with password also.I'm using master page so because of contentplaceholder the page is refreshing.So can any one help me how to avoid this page refresh???and I want to check the confirm password textbox with password textbox before clicking on submit button with out page refresh