JavaScript Run Once: JavaScript

JavaScript Run Once

I need to run the following code one time only. If a user comes back to the page containing the code, it should not run again. I have been looking at using cookies, but am not sure of the exact implementation.

goSub("/user/site/browseCatalog.do","menu1","top");

Thoughts on best approach? Ideally the cookie (or other means) would expire when the user exits their browser.

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Check the example below

<html>
<head>
<script type="text/javascript">
function getCookie(c_name)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=");
  if (c_start!=-1)
    { 
    c_start=c_start + c_name.length+1; 
    c_end=document.cookie.indexOf(";",c_start);
    if (c_end==-1) c_end=document.cookie.length;
    return unescape(document.cookie.substring(c_start,c_end));
    } 
  }
return "";
}
function setCookie(c_name,value,expiredays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate()+expiredays);
document.cookie=c_name+ "=" +escape(value)+
((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
}
function checkCookie()
{
visited=getCookie('visited');
if (visited!=null && visited!="")
  {
	;
  }
  else 
  {
	//first visit, do what you want
	//put your goSub here
	//goSub("/user/site/browseCatalog.do","menu1","top");
	alert('Welcome for your first visit!');
	//set cookie to expire once browser close
    setCookie('visited','true',null);
  }
}
</script>
</head>
<body onLoad="checkCookie()">
</body>
</html>

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JavaScript Run Once

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