/***** GUID - START *****/
      function onPostBack()
      {
         var y = generateRandomSequence();
         var hdnGuid = document.getElementById("ctl00_hdnGuid");
         hdnGuid.value=y;
      }
      function generateRandomSequence() 
      { 
        var g = ""; 
        for(var i = 0; i < 32; i++) 
        g += Math.floor(Math.random() * 0xF).toString(0xF) 
        return g; 
      }
/***** GUID - END *****/