How to find your Popup is blocked by Popup blocker in javascript when using

We open a window using in our pages using javascript. But if there is popup blocker sitting in the client machine and the user is not aware the popup blocker is blocking the popup window from your site, we can inform him the popup is blocked and ask him to remove that. How?'yourfile.htm' + "?newwin=true", "_top", "width="+wwidth+",height="+wheight+",location=0,menubar=0,resizable=no,scrollbars=no,status=yes,titlebar=no,dependent=yes");
alert("Error: While Launching New Window...nYour browser maybe blocking up Popup windows. nn  Please check your Popup Blocker Settings");
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