Return Main Page

call from formvalue to below function

suppose you have defined your function

function formvalue()
{
var MyForm=get myfrom ;
     return  checkValues(MyForm);
}

// email and display text is empty then your if condition should be true right..
//use below code.

 function checkValues(MyForm) {
  var e1 = document.getElementById("<%=txtEmail.ClientID%>").value;
  var e2 = document.getElementByI("<%=txtDISPLAY.ClientID%>").value;
  if (e1 == "" || e2 == "") {
  alert('Return value of gEBI: ' + e2.value);
  window.location.href = 'LetterWorksheet.asp';
  }
  else {
  return true;
  }
  }

function checkValues(MyForm)
{
 var e1 = document.getElementById('txtEmail');
 var e2 = document.getElementById('txtDISPLAY');
 if(e1 ==null)
 {
alert('Return value of gEBI: ' + e2.value);
window.location.href ='LetterWorksheet.asp';
}
else
 {
return true;
 }
} this is my function but this is redirect next page

//do like this..
var obj = null;
 if(obj== null)
{
 alert ("");//some message
 window.location.href = 'mainpage.asp';
 }
 else { return true; }

I want to this type of message like

if(var== null)
{
alert ("");//some message
window.location.href = 'mainpage.asp';
} else
{
return true;
}
}

this is right or wrong