I would like to open a popup window using javascript in my c#.net app. This is the code in the body tag in my webform

<script language=javascript>
    function openWindow(strEmail)
    {        
    window.open('CheckEmail.aspx?email=' + strEmail + , 'Check Email','left=100,top=100,toolbar=no,scrollbars=yes,width=680,height=350');
    return false;
    }
</script>

this is my code in the Page_Load section

this.btnCheck.Attributes.Add("onclick", "return openWindow(" + txtEmail.Text + ");");

right now I'm trying to pass the string from my textbox "txtEmail" so in my popup window i can get the request.querystring but Im a little unsure of how the syntax is.