Select a part of the page via JavaScript

function selectText(obj){
    if (dojo.isIE) {
        range = document.body.createTextRange();
        range.moveToElementText(obj);
        range.select();
    } else {
        selection = window.getSelection();
        range = document.createRange();
        range.setStartBefore(obj);
        range.setEndAfter(obj) ;
        selection.addRange(range);
    }
}