var postitnote;//global variable

function changeImage(filename){
document.getElementById('mainimage').src = filename;
}

function rollY(linkname,imagenumber){

if(postitnote == null){
document.getElementById('no').getElementsByTagName('a')[0].style.color = '#fff';
}

if(postitnote && postitnote.style){
postitnote.style.color = '#fff';
}

linkname.style.color = '#000';
postitnote = linkname;

changeImage('images/n_'+imagenumber+'.jpg');

}


window.onload = function(){
document.getElementById('no').getElementsByTagName('a')[0].style.color = '#000';
}