function setCookie(name,value,days) {
    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=/";
}

function getCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
}

function deleteCookie(name) {
    setCookie(name,"",-1);
}

function item2cookie(button,item,txt,className){
 if(!txt) var txt='Item added to cart!';
 var cart_str=getCookie('cart_cookie');
 if(cart_str==null || cart_str=='empty') cart_str='';
 //alert(item+'->'+cart_str);
 if(cart_str.indexOf(item)==-1){
  if(cart_str!='') cart_str+='_';
  cart_str+=item;
  setCookie('cart_cookie',cart_str,350);
 }
 button.innerHTML=txt;
 button.className=className;
 button.onclick = null;
 return false;
}

// get screen resolution
if(getCookie('screen_size')==null) setCookie('screen_size',screen.width+'x'+screen.height,30);