Here is the code that will show a confirmation message if user want to close browser window/close.
<form name="form1" id="form1">
<input type="submit" name="btn1" value="Submit1" onclick="return chk();">
</form>
<form name="form2" id="form2">
<input type="submit" name="btn1" value="Submit2">
</form>
<script language="javascript">
var fillout = false;
window.onbeforeunload=function verifyclose() {
var undefined;
var msg;
if (document.forms[0] == undefined)
return;
if (!fillout) {
msg = " Do you want quit/close this window?";
}
return msg;
};
function chk() {
return false;
}
</script>
