javascript welcome message with cookie

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Javascript

Hi! Can you help me improve this code in that when "OK" is clicked, cookie is set but when "Cancel" is clicked, cookie is not set

function rC(nam) 
{
var tC = document.cookie.split('; '); 
for (var i = tC.length - 1; i >= 0; i--) 
{
  var x = tC[i].split('=');
  if (nam == x[0]) 
    return unescape(x[1]);
} 
return '~';
} 

function wC(nam,val) 
{
document.cookie = nam + '=' + escape(val);
} 

function lC(nam,pg) 
{
var val = rC(nam); 
if (val.indexOf('~'+pg+'~') != -1) 
  return false; 

val += pg + '~'; 
wC(nam,val); 
return true;
} 

function firstTime(cN) 
{
return lC('pWrD4jBo',cN);
} 

function thisPage() 
{
var page = location.href.substring(location.href.lastIndexOf('\/')+1); 
pos = page.indexOf('.');
if (pos > -1) 
{
page = page.substr(0,pos);
} 
return page;
}

// example code to call it - you may modify this as required
function start() {
   if (firstTime(thisPage())) {
      // this code only runs for first visit
      var answer = confirm ("Please click on OK to continue loading my page, or CANCEL to be directed to the Yahoo site.")
if (!answer)
window.history.back();
   }
   // other code to run every time once page is loaded goes here
}
onload = start;