function createTag(tagname, text, options) {
    var newTag = document.createElement(tagname);
    if (text != null) newTag.appendChild(document.createTextNode(text));
    for (var cnt in options) {
        newTag.setAttribute(cnt, options[cnt]);
    }
    return(newTag);
}
 
removeChildNodes = function(node) {
  if (node){
    if (!node.hasChildNodes()) { return; }
    while (node.childNodes.length > 0) {
        node.removeChild(node.childNodes[0]);
    }
}
}