function showPopUp(){


var height = 450;
var width = 350;
var winl = (screen.width-width)/2;
var wint = (screen.height-height)/2;

var wname = "refer";

var size="width=" + width + ",height=" + height + ",left=" + winl + ",top=" + wint + ",scrollbars";

var w=window.open("",wname,size);


var d = w.document;

d.location = "/recommend.html";
d.close();
}