Convert my old cookies to session variable(s)

I use extensively cookies in my web applications, but have reached the 4 kB limit. So now I need to 'convert' all my cookies to session variables. Have got an idea how I can create such for one variable, but here I have multi element cookies. Reading the php manual gives me no idea on how to do this. Here's the recipe for my cookies: function formCookie() { var cookieValue = document.$formname.totalAns.value+'|'; // Using '|' to split each part of the cookie cookieValue += document.form01.correct.value+'$test[1]'+document.form01.question1.value+doc ument.form01.answer.value+'|'; cookieValue += document.form02.correct.value+'$test[1]'+document.form02.question2.value+doc ument.form02.answer.value+'|'; <more lines> document.cookie = '$answercookie='+escape(cookieValue)+';expires='; }