var newwindow;   
   function submitEmail(frm)
    {
     var email=document.getElementById('Newsletter1_TxtNewsEmail').value;
     if(email =="")
	    {
	        alert("Please Enter Valid Email Id");
		    document.getElementById('Newsletter1_TxtNewsEmail').focus();
		    document.getElementById('Newsletter1_TxtNewsEmail').select();
		    return false;
	    }

	if (email.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) == -1)
        {
	    	alert("Enter valid Email Id")
			document.getElementById('Newsletter1_TxtNewsEmail').focus();
			document.getElementById('Newsletter1_TxtNewsEmail').select();
			return false;
		}
	else
	    {		
           <!--email=frm.TxtNewsEmail.value;-->
    		
             newwindow=window.open("Newsletter-close.aspx?email="+email,"cw","width=250,height=180,scrollbar=false");
             newwindow.focus();
      	      return false;
        }
    }