JAVASCRIPT YES NO ALERT

function PrintAlert()
        {  
            ModalPopups.Confirm("idConfirm1",  
            "Print Confirmation",  
            "<div style='padding: 25px;text-align:center;'>Print OK ?</div>",   
            {  
                yesButtonText: "Yes",  
                noButtonText: "No",  
                onYes: "ModalPopupsConfirmYes()",  
                onNo: "ModalPopupsConfirmNo()" 
            }            
            );  
        }  
function ModalPopupsConfirmYes() {  
   // alert('You pressed Yes');  
    ModalPopups.Close("idConfirm1");  
  var printflag = "Y";
   var txtSearchClientID="<%=Hiddden_grid_value.ClientID%>";
            GetPrint(printflag,document.getElementById(txtSearchClientID).value);
}  
function ModalPopupsConfirmNo() { 
var printflag = "N";
  //  alert('You pressed No');  
    ModalPopups.Cancel("idConfirm1");  
     var txtSearchClientID="<%=Hiddden_grid_value.ClientID%>";
            GetPrint(printflag,document.getElementById(txtSearchClientID).value);
   
}


function GetPrint(print,maxkey)
        {
            if(print!="")
            {
            alert(print);
                var hfPrintClientID="<%=hfPrint.ClientID%>";
                var hfPrint=document.getElementById(hfPrintClientID);
                hfPrint.value=print;
                var hfmaxkeyClientID="<%=hfmaxkey.ClientID%>";
                var hfmaxkey=document.getElementById(hfmaxkeyClientID);
                hfmaxkey.value=maxkey;
                var btnRefreshViewClientID="<%=btnRefreshView.ClientID %>";
                var btnRefreshView=document.getElementById(btnRefreshViewClientID);
                btnRefreshView.click();
            }
        }


<script language="javascript" type="text/javascript" src="../Scripts/ModalPopups.js"></script>