(function (){ 
var defaultStyleText = 'default spec. style'; 
var additionalStyleText = "additional spec. style"; 
var toggle; 
function toggleStyle(){ 
var st = document.getElementById('st'); 
if (st.hasAttribute('disabled') === true ) { 
st.removeAttribute('disabled'); 
st.disabled = false ; 
toggle.textContent = defaultStyleText; 
} 
 else { 
_AN_Call_setattribute('setAttribute', st, 'disabled', 'true'); 
st.disabled = true ; 
toggle.textContent = additionalStyleText; 
} 
} 
window.onload = function (){ 
var st = document.getElementById('st'); 
var divHead = document.getElementById('div-head'); 
var defaultText = additionalStyleText; 
toggle = _AN_Call_createelement('createElement', document, 'a'); 
divHead.insertBefore(toggle, divHead.firstChild); 
toggle.textContent = defaultText; 
_AN_Call_setattribute('setAttribute', toggle, 'class', 'toggle'); 
_AN_Call_setattribute('setAttribute', toggle, 'href', '#'); 
toggle.addEventListener("click", toggleStyle, false ); 
} 
; 
} 
)();