function ga(v1 , v2 , v3) {

  var aap = "@";
  var noot = ".";
  var where = "entersystems";
  var dom = "nl";
  var e1 = "?";
  var e2 = "Subject=" + v2 +"";
  document.write("<" + "a" + " " + "href=" + "mail" + "to:" + v1 + aap + where + noot + dom + e1 + e2 +">" + v3 + "<\/a>");

 }