function showlogin() {

    var body = document.getElementsByTagName('html')[0];
    var loginbg = document.getElementById('loginbg');
    var loginform = document.getElementById('loginform');
    
    loginbg.className = 'show';
    loginbg.style.height = body.clientHeight + 'px';
    loginbg.style.width = body.clientWidth + 'px';
    		    
    var pagemidt = ((body.clientHeight / 2) - 85);
    var pagemidl = ((body.clientWidth / 2) - 100)

    loginform.className = 'show';
    loginform.style.top = pagemidt + 'px';
    loginform.style.left = pagemidl + 'px';
    
    var un = document.getElementById('ctlLogin$Username');
    un.focus();
    
}

function hidelogin() {

    var loginform = document.getElementById('loginform');
    var loginbg = document.getElementById('loginbg');

    loginform.className = 'hide';
    loginbg.className = 'hide';
 
    var loginerrors = document.getElementById('loginerrors');
    loginerrors.innerText = '';
   
    return false;

}