function css(e,s){
  if(!e.nodeType) for(var i = 0; i < e.length; i++) css(e[i],s);
  else{
    if(typeof(s) != 'object') return e.style[s];
    for(var i in s) e.style[i] = s[i];
  }
}

var el = document.getElementById('myElement');
css(el,{'width':'200px'});
alert(css(el,'width')); // 200px