How to make javascript only take effect once per browser session

[se_p800]

Ok bare with me i am new to html. I posted a similar thread but realised I was asking the wrong thing so I thought it best to start again.

The javascript I am using is called modalbox. In order for it to work you have to add the neccessary files to your server and paste this code into your pages:

<link rel="stylesheet" href="popup/modalbox.css" type="text/css" media="screen" />
<script type="text/javascript" src="popup/prototype.js"></script>
<script type="text/javascript" src="popup/scriptaculous.js?load=effects"></script>
<script type="text/javascript" src="popup/modalbox.js"></script>

I have got everything working fine except I only want this script to take effect once per browser session as shown here

I have tried adding this after the code:

<script type="text/javascript">
submitTags : function()
{
var btnSubmitTags = document.getElementById( TagsHelperConfig.FORM_TAGS_ENTRY_SUBMIT_BUTTON_ID );


btnSubmitTags.click();
}
</script>

As from what I can tell from the source code on the website I just listed that is what they have used, but I am having no luck. Is anybody able to modify the code I have pasted to make it only take effect once per browser session? If so I would be so appreciative. Thanks

[se_p800]

Is anybody able to help me? Thanks

[Marco van Herwaarden]

Sorry but i don't understand what you mean with "only take effect once per browser session"

[se_p800]

Basically, this popup will "pop-up" every time the page is viewed, and I only want to to "pop-up" once per browser session, or even once per 24 hours. So once it has popped up, if the oage is viewed again, nothing will happen. Thanks

[MoT3rror]

You can use cookies. When the cookie exists don't show the popup. If cookie doesn't exist show popup and create cookie.

[se_p800]

Originally Posted by MoT3rror

You can use cookies. When the cookie exists don't show the popup. If cookie doesn't exist show popup and create cookie.

Right ok someone suggested that on another forum aswell, but as I said im new to all this, would it be too much trouble to explain what I would have to do? Thanks

EDIT: Ok I think I have to send a cookie that lasts for 24 hours? How would I do this please?