Microsoft JScript runtime error: Object expected

[pratimapaudel]

function Showdiv()
{
var SelectStates = document.getElementById('Select1').value;
if(SelectStates ="3")
{
document.getElementById("div2").style.display = "block";
}
else

document.getElementById("div2").style.display = "none";
}
function GoToPage()
{
var SelectStates = document.getElementbyId('Select1').Value;
window.open('LotteryResultPage.aspx?country='+Sele ctStates+);
}
I have above js function and i am calling those function like below in the ascx control.

<select id="Select1" onchange="Showdiv()">

<asp:Button runat="server" ID="Button1" Text="Go" OnClientClick="GoToPage()" />

but when i run this it gives error 'Microsoft JScript runtime error: Object expected' , can anybone tell me why?
thanks
pratima

[Plater]

if that code is cut and paste then the problem is this:

window.open('LotteryResultPage.aspx?country='+Sele ctStates+);


You have an extra + at the end of your string