How can I avoid post back inside a tab on image button click

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ASP.NET

I have 4 tabs and inside each tab I have an Image button but when I click on any Image button every time that post back to the first active tab and not on the current tab

please advice what should i do

What I have tried:

I have created one div with id "tabs" and I kept the tabs inside this div and then I have written a java script code:

$(function () {
$("#tabs").tabs();
// set hash on tab change
$('#tabs ul li a').click(function () {
location.hash = $(this).attr('href');
});

//maintain hash on post back
$('#<%=Page.Form.ClientID%>').attr('onsubmit', 'this.action += top.location.hash');
})