Important site message is displayed here.

Updated: January 15, 2009.

This script uses jQuery and Thickbox to present a message in a modal window on the first visit during the browser session. It does the following:

  1. creates two cookie functions (create and read)
  2. creates a function to show the popup
  3. looks for a cookie called mypopup
  4. if it’s absent:
    • shows a modal window
    • sets a cookie called mypopup

Code

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function showModal() {
	tb_show('Important message','#TB_inline?height=300&amp;width=450&amp;inlineId=promo',false);
}

var visited = readCookie('mypopup');

if (!visited) {
	$(document).ready(function(){
		showModal();
		createCookie('mypopup','no',0);
	});
}

Sources: