function determineMethod()
{
    var currentMethod;
    var sPath = window.location.toString();

    if(sPath.indexOf("SearchInterface") != -1)
    { 
        currentMethod = 1;  //Search
    }
    else if(sPath.indexOf("Shopping/ProductDetails.aspx") != -1)
    {
        currentMethod = 2;  //Cross Sell
    }
    else if(document.referrer == "http://www.shoes.com" && sPath.indexOf("ProductDetails.aspx") != -1)  
    {
        currentMethod = 3;  //Internal Campaign
    }
    
    if(sPath.indexOf("ProductDetails.aspx") != -1)
    {
        if(currentMethod == 2)
        {
            setCookie("pfm","cross-sell",1)    
        
        }
    }    
    else
    {
        switch (currentMethod)
        {
            case 1: setCookie("pfm","search",1); break;
            case 2: setCookie("pfm","cross-sell",1); break;
            case 3: setCookie("pfm","internal campaign",1); break;
            default: setCookie("pfm","browse",1); //If none of these then it is browse
        }
    }              
}

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());
}

Event.observe(window, 'load', determineMethod);