Help with creating a Cookie

Hi There,

I'm building an e-commerce website:

http://www.calusa-surf-ski.co.uk/

However I'm struggling to get something to work with the navigation on the right hand side, under the search box.

As you can see, there are 2 seperate navigations for Male & Female. If you click on female, and then navigate away from the page, I would like the website to remember that you have the female navigation currently selected, instead of it always defaulting back to male.

I assume this should be a straight foward Javascript that generates a cookie, however I'm struggling with my limited knowledge of Javascript.

Thank you in advance to anyone who can help me.

 

You may use this javascript code for creating cookies.

function createCookie(name,value,days) // fn. for creating cookies
{
  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=/";
}

Code (markup):