function fnValidateLogin(){
var username=document.getElementById('txtUserName').value.replace(/^\s+|\s+$/g, '');
var password=document.getElementById('txtPassword').value.replace(/^\s+|\s+$/g, '');
if(username.length==0){
alert('Please enter user name');
document.getElementById('txtUserName').value="";
document.getElementById('txtUserName').focus();
return false;
}
if(password.length==0){
alert('Please enter password');
document.getElementById('txtPassword').value="";
document.getElementById('txtPassword').focus();
return false;}    return true;}
function fnClear(){
document.getElementById('txtUserName').value="";
document.getElementById('txtPassword').value="";
document.getElementById('txtUserName').focus();
return false;}
function IsValidInput(e){
var key = e.keyCode ? e.keyCode : e.which ? e.which : e.charCode;
if((key==39)){
alert("Special characters not allowed");
return false;
}return true;}