how to find browser is minimize or maximize or not

You can try to check the window.outerWidth, window.outerHeight values (in Firefox) of the browser to identify the minimized state.

It is not working in all browsers,let me know if any other way

It cannot be done. Alternately, you can use your own functions to minimize [not exactly] the window and control your probing.

For this, the below code may be helpful.

<SCRIPT LANGUAGE="JavaScript">
 
function Minimize()
{
window.innerWidth = 100;
window.innerHeight = 100;
window.screenX = screen.width;
window.screenY = screen.height;
alwaysLowered = true;
}
 
function Maximize()
{
window.innerWidth = screen.width;
window.innerHeight = screen.height;
window.screenX = 0;
window.screenY = 0;
alwaysLowered = false;
}
</SCRIPT>
 
<A HREF="javascript:onClick=Minimize()">Click Here To Minimize</A>
<A HREF="javascript:onClick=Maximize()">Click Here To Maximize</A> 

Select allOpen in new window

I have already seen it.but it is functions for Minimize/Maximize.But I want to detect both these events,whether browser is minimized or maximized

I afraid that you cannot detect whether the browser is minimized or not.

If you use the above function, you can track the browser minimized status, if the user used the above function to minimize the browser, you can control your probe action by introducing a new variable in the above code.

Hope it is clear.

but it is not working in IE browser