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Added initial code.

popup.js

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+/*	Popup Window Applet for Chrome 
+	buzzcode2007
+*/
+
+var popup_window = {};
+
+function main() {
+	update_config();
+	start_browse();
+};
+
+function display_error(message, critical) {
+	/* 	Display an error message. 
+		Returns: user's selection
+	*/
+
+	if (critical) {
+		alert(message);
+		return(false);
+	} else {
+		var user_selection = confirm(message);
+		return(user_selection);
+	};
+}
+
+function update_config() {
+	/* Updates parameters. */
+	var params = `scrollbars=no, status=no, location=no, toolbar=no, menubar=no`;
+	popup_window[`parameters`] = params;
+};
+
+function request_URL() {
+	/* 	Request for the URL, and check if it is valid. 
+
+		Returns: bool on navigation status */
+	while (true) {
+		var user_navigate_URL = String(prompt(`Input a URL of another website or of a page within.`)).trim();
+
+		var check_URL = urlString=> {
+	  	var urlPattern = new RegExp('^(https?:\\/\\/)?'+ // validate protocol
+	    '((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|'+ // validate domain name
+	    '((\\d{1,3}\\.){3}\\d{1,3}))'+ // validate OR ip (v4) address
+	    '(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*'+ // validate port and path
+	    '(\\?[;&a-z\\d%_.~+=-]*)?'+ // validate query string
+	    '(\\#[-a-z\\d_]*)?$','i'); // validate fragment locator
+	  return !!urlPattern.test(urlString);
+	}
+		var user_navigate_URL_valid = check_URL(user_navigate_URL);
+
+		if (user_navigate_URL_valid) {popup_window[`URL`] = user_navigate_URL; return(true);} 
+		else if (!(user_navigate_URL)) {return (false);};
+	};
+};
+
+function display_URL(URL) {
+	/* 	Display the URL in a pop-up. 
+		Returns: pop-up display status
+		*/
+	while (true) {
+		var popup_window_instance = {}		
+		popup_window_instance[`status`] = window.open(URL, URL, popup_window[`parameters`]);
+
+		if (!(popup_window_instance[`status`])) {
+			if (!(display_error(`The pop-up has been blocked! \nTo continue, try un-blocking it first for this site. `))) {
+				return (false); break;
+			};
+		} else {
+			return(true);
+		};
+	};
+};
+
+
+function start_browse() {
+	user_browse_confirm = request_URL();
+	
+	if (user_browse_confirm) {
+		display_URL(popup_window[`URL`]);
+	};
+};
+
+main();

popup.min.js

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+var popup_window={};function main(){update_config(),start_browse()}function display_error(o,t){return t?(alert(o),!1):confirm(o)}function update_config(){popup_window.parameters="scrollbars=no, status=no, location=no, toolbar=no, menubar=no"}function request_URL(){for(;;){var o,t=String(prompt("Input a URL of another website or of a page within.")).trim();if(o=t,RegExp("^(https?:\\/\\/)?((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|((\\d{1,3}\\.){3}\\d{1,3}))(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*(\\?[;&a-z\\d%_.~+=-]*)?(\\#[-a-z\\d_]*)?$","i").test(o))return popup_window.URL=t,!0;if(!t)return!1}}function display_URL(o){for(;;){var t={};if(t.status=window.open(o,o,popup_window.parameters),t.status)return!0;if(!display_error(`The pop-up has been blocked! 
+To continue, try un-blocking it first for this site. `))return!1}}function start_browse(){(user_browse_confirm=request_URL())&&display_URL(popup_window.URL)}main();