//キャッシュ対策
var param = parseInt(Math.random() * 100000000000);
/**
 * session_store
 */
function session_store() {
    new Ajax.Request("./session_store.php?param=" + param,{
       method : "post",
       postBody : Form.serialize("item_data")
	});
}
function link_make(){
    $("m_link").setAttribute("href",$("m_link").getAttribute("href") + "?param=" + param);
}

Event.observe(window,"load",loading,false);
function loading(){
    link_make();
    session_store();
}