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  function getById(id) {       return !id ? null : document.getElementById(id); }
 
 
 
 
 
  function getAttr(id, k) {      if (id) {            var v = document.getElementById(id).getAttribute(k)             return v;       } }           
 
 
 
 
  function setAttr(el, k, v) {     if (el) {        el.setAttribute(k, v);     } }        
 
 
 
 
  function getCss(el, k) {      if (el) {        if (el.style[k]) {            return el.style[k];        }            return null;      } }
 
 
 
 
 
 
  function setCss(el, k, v) {       if (el) {            if (!el.style || el.style.length == 0) {                el.style = {};            }             el.style[k] = v;        } }
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