Kod
function switchStyle(strTagName, strClassName, newClassName){
var arrElements = (strTagName == "*" && document.all)? document.all : document.getElementsByTagName(strTagName);
var element;
for(var i=0; i<arrElements.length; i++){
element = arrElements[i];
if(element.className==strClassName){
element.className=newClassName;
}
}
}
switchStyle("tr", "nad_id55", "NowyStyl");
Troche niezbyt eleganckie, ale działa