All the php file does is echo's a div with some information(cart total and items amount)
the php file i am trying to echo is /club-shops2/php/update-cart-div.php
var params = "club_id="+club_id+"&size_id="+size_id+"&product_id="+product_id+"&quantity="+quantity;
xmlhttp.open("POST", "/club-shops2/php/add-to-cart.php", true);
document.getElementById("details").innerHTML = "update me";
Anyone have any ideas what i put in the "update me" to echo the php file?