Hi I would like the popup to show once per week. So basically, I would like to cookie to set for one week.

Would this work:

37 function createCookie(name,value,hours) {
38 if (hours) {
39 var date = new Date();
40 //Here is change 60*60 to 60*10080 to cause the popup to only appear after 7 days (604,800/60) = 10080
41 date.setTime(date.getTime()+(hours*60*10080));
42 var expires = "; expires="+date.toGMTString();
43 }
44 else expires = "";
45 document.cookie = name+"="+value+expires+"; path=/";
46 }