function popup(theURL,winName,width,height) 
{   
   var left = (screen.width-width)/2;
   var top = (screen.height-height)/2;
   
   var features = "toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=" + width + ", height=" + height + ",left = " + left + ",top = " + top;
   
   newwindow = window.open(theURL,winName,features);
   
   if (window.focus)
      newwindow.focus();
   
   return false;
}

function ValidateEmail(sender, args)
{
   var email = document.getElementById("Email").value;
   //var emailReg = "^[\\w-_\.]*[\\w-_\.]\@[\\w]\.+[\\w]+[\\w]$";
   //var regex = new RegExp(emailReg);
   var regex = /^[a-zA-Z0-9._-]+@([a-zA-Z0-9.-]+\.)+[a-zA-Z0-9.-]{2,4}$/;

   if (regex.test(email))
      args.IsValid = true;
   else
      args.IsValid = false;            
}