Filtering not able to save

Hi,

Am applying filters on the option-set to get the lookup field value. here is the code:

function SetFilterLookup() {
//debugger;
    if ((Xrm.Page.getAttribute("optionsetval").getSelectedOption() != null)&&(Xrm.Page.getAttribute("lookup1").getValue() != null)) {
        var _Text = Xrm.Page.getAttribute("optionsetval").getSelectedOption().text;
if(_Text=='title')
_Text='title_name';
      var _Value = Xrm.Page.getAttribute("optionsetval").getSelectedOption().value;
      var countyId= Xrm.Page.getAttribute("lookup1").getValue()[0].id;
 //alert(guid_lkp);
        var viewId = '{30A7616D-6A84-E211-0000-0000569C13E4}';
        var entityName = "contact";
        var viewDisplayName = "Active contacts for " + _Text;
        var fetchXml = "
.....
.......
....";

        //build grid layout
        var layoutXml = "....
.....
..
";
        //add new view
Xrm.Page.getControl("lookup2").addCustomView(viewId, entityName, viewDisplayName, fetchXml, layoutXml, true);   
    }
}

everything works fine until i save the form, the lookup2 which am setting to the form is going empty.  any help would greatly be appreciated