if you open pop-up window using javascript by window.open funtion than in pop-up window your are not able to view address bar,menu etc so you can not click on refresh button becuase its not visible...but you can refresh page by pressing F5 key so write following block in script tag of .aspx page...
// Write following code of block in script tag like
<script type="text/javascript">
document.attachEvent("onkeydown", my_onkeydown_handler);
window.history.forward(1);
document.attachEvent("onkeydown", my_onkeydown_handler);
function my_onkeydown_handler() {
switch (event.keyCode) {
case 116:
event.returnValue = false;
event.keyCode = 0;
window.status = "We have disabled F5";
window.event.cancelBubble = true;
break;
}
}
</script>
its solve your problem....