Detect if a window is already openedTag(s): Language
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<HTML><HEAD><SCRIPT>
var myPage;
function openMyPage() {
if (!myPage || myPage.closed){
myPage =
window.open("myPage.html", "_blank");
}
else {
alert("MyPage.html is already opened");
}
}
</SCRIPT></HEAD>
<BODY>
<FORM>
<INPUT TYPE="button"
onClick="openMyPage();"
VALUE="open MyPage">
</FORM></BODY></HTML>