check for blocked Popups

check_popupblocker.js

var popup = window.open(location.href,'testPopup',"height=1, width=1",true);
 setTimeout( function() {
    if(!popup || popup.outerHeight === 0) {
        //First Checking Condition Works For IE & Firefox
        //Second Checking Condition Works For Chrome
        alert("Popup Blocker is enabled! Please add this site to your exception list.");
    } else {
        //Popup Blocker Is Disabled
        popup.close();
    } 
}, 25);