var WaterMark = {
  init: function() {
    WaterMark.Init();
  },
    Init: function() {
     $(".watermark").focus(function() {WaterMark.WMfocus(this)}).blur(function() { WaterMark.WMblur(this)});    
  },
  WMfocus: function(tb) {
    if(tb.value == tb.defaultValue) { 
        tb.value = "" ; 
        tb.className = "bgx shadow-tb";
      }
  },
  WMblur: function(tb) {
    if(tb.value == "") {
        tb.value = tb.defaultValue;
        tb.className = "bgx shadow-tb watermark";
      }
  }
};

$(WaterMark.init);