function loesche(where,what){if(document.getElementById(where).value == what) document.getElementById(where).value = ''; }
function loescheUser() {if (document.getElementById('login').value=='Benutzername') document.getElementById('login').value='';}
function loeschePwd() {if (document.getElementById('password').value=='Passwort') document.getElementById('password').value='';}