function styleHeaderSiblings(){ if(!document.getElementByTagName)return false; var headers = document.getElementByTagName("h1"); for(var i = 0;i<headers.length;i++){ addClass(elem,"intro"); } } function styleElementSiblings(tag,thechass){ if(!document.getElementByTagName)return false; var elems = document.getElementsByTagName(tag); for(var i = 0 ;i<elems.length;i++){ var elem = getNextElement(elem[i].nextSibling); addClass(elem,theclass); } } function addClass(elemnt,value){ if(!element.className){ element.className = value; }else{ newClassName = element.className; newClassName +=""; newClassName +=value; element.className = newClassName; } }