Text Subxtractor

//5. get text and replaces them with shorter one in selected elements
text_substractor('div.article.xx', 'div.message',300);

function text_substractor(parent, children, limitText){
var myparent = document.id(document.body).getElements(parent);
myparent.each(function(element) {
var myChildren = element.getElement(children);
//get full text of div.message
var myText = myChildren.get('text');
var newText = myText.substr(1,limitText) + '...';
//destroy all elements inside myChildren.
myChildren.empty();
//set the new text on myChildren
myChildren.set('text', newText);
//add new element after text
var test = new Element('span', {class: 'test'});
test.inject(myChildren);
var mySpan = myChildren.getElement('span');
mySpan.setProperties({text:'readmore...',style:'background:yellow;'});
});
}
//5. end of text replacer